----

|   | UNITED STATES |
|--------|---------------|

| Delaware                                  |   | 75-2332176          |
|-------------------------------------------|--------|---------------------|
| (State or other jurisdiction              |   | (I.R.S. Employer    |
| of incorporation or organization)         |   | Identification No.) |
|                                      |   |                |
| 6 Desta Drive, Suite 6500, Midland, Texas |   | 79705               |
| (Address of principal executive office)   |   | (Zip Code)          |

| Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.                                                                                                                                                                                                                                    |  ̈ Yes | x No      |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|------------|-----------|
|                                                                                                                                                                                                                                                                                                                                                       |       |      |
| Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act.                                                                                                                                                                                                                               |  ̈ Yes | x No      |
|                                                                                                                                                                                                                                                                                                                                                       |       |      |
| Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.   | x Yes      |  ̈ No |
|                                                                                                                                                                                                                                                                                                                                                       |       |      |
| Indicate by check mark whether the registrant has submitted electronically and posted on its corporate website, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files). |  ̈ Yes |  ̈ No |

| Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained herein, and will not be contained, to the best of registrant's knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K.x |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, or a non-accelerated filer.  See definition of “accelerated filer and large accelerated filer” in Rule 12b-2 of the Exchange Act. |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| Large accelerated filer  ̈                                                                                                                                                                                                                            |   | Accelerated filer  ̈ |   | Non-accelerated filer  x |   | Smaller reporting company ̈ |   |

| Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act). |  ̈ Yes | x No |
|---------------------------------------------------------------------------------------------------------|------------|------|

|   |
|--------|

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|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             | Page   |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|--------|
| Part I                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |   |
| Item 1.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   | Business                                                                                                                                                    | 3      |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |   |
| Item 1A.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  | Risk Factors                                                                                                                                                | 7      |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |   |
| Item 1B.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  | Unresolved Staff Comments                                                                                                                                   | 8      |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |   |
| Item 2.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   | Properties                                                                                                                                                  | 9      |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |   |
| Item 3.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   | Legal Proceedings                                                                                                                                           | 10     |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |   |
| Item 4.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   | Submission of Matters to a Vote of Security Holders                                                                                                         | 10     |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |   |
| Part II                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |   |
| Item 5.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   | Market for Registrant's Common Equity, Related                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |   |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      | Stockholder Matters and Issuer Purchases of Equity Securities                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    | 11     |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |   |
| Item 6.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   | Selected Financial Data                                                                                                                                     | 12     |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |   |
| Item 7.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   | Management's Discussion and Analysis of                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |   |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      | Financial Condition and Results of Operations                                                                                                                                   | 13     |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |   |
| Item 7A.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  | Quantitative and Qualitative Disclosures About Market Risk                                                                                                  | 15     |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |   |
| Item 8.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   | Financial Statements and Supplementary Data                                                                                                                 | 16     |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |   |
| Item 9.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   | Changes in and Disagreements with Accountants                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |   |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      | on Accounting and Financial Disclosure                                                                                                                                          | 29     |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |   |
| Item 9A.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  | Controls and Procedures                                                                                                                                     | 29     |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |   |
| Item 9B.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  | Other Information                                                                                                                                           | 30     |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |   |
| Part III                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |   |
| Item 10.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  | Directors, Executive Officers and Corporate Governance                                                                                                      | 31     |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |   |
| Item 11.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  | Executive Compensation                                                                                                                                      | 31     |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |   |
| Item 12.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  | Security Ownership of Certain Beneficial Owners and Management and                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |   |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      | Related Stockholder Matters                                                                                                                                                     | 32     |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |   |
| Item 13.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  | Certain Relationships and Related Transactions, and Director Independence                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        | 32     |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |   |
| Item 14.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  | Principal Accounting Fees and Services                                                                                                                      | 32     |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |   |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |   |
| Part IV                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |   |
| Item 15.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  | Exhibits and Financial Statement Schedules                                                                                                                  | 33     |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |   |
| Glossary of Oil and Gas Terms                                                                                                                   | 34                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |   |
| Signatures                                                                                                                                      | 36                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |

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| ·   | amends the definition of proved reserves to require the use of average commodity prices based upon the prior 12 month period rather than year-end prices; |
|--------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------|

| ·   | expands the type of technologies available to establish reserve estimates and categories; |
|--------------------|-------------------------------------------------------------------------------------------|

| ·   | modifies certain definitions used in estimating proved reserves; |
|--------------------|------------------------------------------------------------------|

| ·   | permits disclosure of probable and possible reserves; and |
|--------------------|-----------------------------------------------------------|

| ·   | permits disclosure of reserves based on different price and cost criteria, such as futures prices or management forecasts. |
|--------------------|----------------------------------------------------------------------------------------------------------------------------|

|                               |   | Proved Developed |    |   | Proved       |   |   | Total       |   |
|------------------------------------|--------|------------------|---------|--------|--------------|--------|--------|-------------|--------|
|                               |   | Producing        |    |   | Nonproducing |   |   | Undeveloped |   |   | Proved |   |
| Oil (Bbls)                         |   |             | 70,000  |   |         |   | -      |        |   |   | 19,000 |   |   |   | 89,000 |   |
| Gas (Mcf)                          |   |             | 145,000 |   |         |   | -      |        |   |   | 19,000 |   |   |   | 164,000 |   |
| Total (BOE)                        |   |             | 94,000  |   |         |   | -      |        |   |   | 22,000 |   |   |   | 116,000 |   |
|                               |   |             |    |   |         |   |   |        |   |   |   |   |   |   |   |   |
| Standardized measure of discounted |   |             |    |   |         |   |   |        |   |   |   |   |   |   |   |   |
| future net cash flows              |   |             |    |   |         |   |   |        |   |   |   |   |   | $ | 1,127,000 |   |

|                                       |   | Proved Reserves |   |   |   |   |
|--------------------------------------------|--------|-----------------|--------|--------|--------|--------|
|                                       |   |            |   |   |   |   |   | Total Oil |   |   | Percent of |   |
|                                       |   | Oil             |   |   | Gas    |   |   | Equivalent |   |   | Total Oil |   |
|                                       |   | (Bbls)          |   |   | (Mcf)  |   |   | (BOE) |   |   | Equivalent |   |
| Vacuum                                     |   |            | 53,000 |   |   |   | 30,000 |   |   |   | 58,000 |   |   |   | 50.0 | % |
| Malaga                                     |   |            | 11,000 |   |   |   | 60,000 |   |   |   | 21,000 |   |   |   | 18.1 | % |
|       Jalmat |   |            | 11,000 |   |   |   | 45,000 |   |   |   | 18,000 |   |   |   | 15.5 | % |
| Other                                      |   |            | 14,000 |   |   |   | 29,000 |   |   |   | 19,000 |   |   |   | 16.4 | % |
| Total                                      |   |            | 89,000 |   |   |   | 164,000 |   |   |   | 116,000 |   |   |   | 100.0 | % |

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Item 

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| Item 5. | Market for Registrant's Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities |
|---------|--------------------------------------------------------------------------------------------------------------|

|           |   | Total Number |   |   |          |   |
|----------------|--------|--------------|--------|--------|---------------|--------|
|           |   | of Units     |   |   | Average Price |   |
| Period         |   | Purchased    |   |   | Paid Per Unit |   |
| January 2009   |   |         | -      |   |          | $      | - |   |
| February 2009  |   |         | -      |   |          |   | - |   |
| March 2009     |   |         | 20.0   |   |          |   | 58.00 |   |
| April 2009     |   |         | -      |   |          |   | - |   |
| May 2009       |   |         | -      |   |          |   | - |   |
| June 2009      |   |         | -      |   |          |   | - |   |
| July 2009      |   |         | -      |   |          |   | - |   |
| August 2009    |   |         | -      |   |          |   | - |   |
| September 2009 |   |         | -      |   |          |   | - |   |
| October 2009   |   |         | -      |   |          |   | - |   |
| November 2009  |   |         | -      |   |          |   | - |   |
| December 2009  |   |         | 56.0   |   |          |   | 58.00 |   |
| TOTALS         |   |         | 76.0   |   |          | $      | 58.00 |   |

|   |
|--------|

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Item 

|                           |   | Years ended December 31, |    |
|--------------------------------|--------|--------------------------|---------|
|                           |   | 2009                     |    |   | 2008 |   |   | 2007 |   |   | 2006 |   |   | 2005 |   |
| Revenues                       |   | $                        | 737,142 |   |   | $ | 1,346,111 |   |   | $ | 1,054,805 |   |   | $ | 1,040,125 |   |   | $ | 1,058,893 |   |
|                           |   |                     |    |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Net income                     |   |                     | 192,711 |   |   |   | 672,543 |   |   |   | 504,105 |   |   |   | 543,105 |   |   |   | 523,823 |   |
|                           |   |                     |    |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Partners' share of net income: |   |                     |    |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
|                           |   |                     |    |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| General partners               |   |                     | 23,391  |   |   |   | 70,502 |   |   |   | 53,697 |   |   |   | 57,202 |   |   |   | 55,028 |   |
|                           |   |                     |    |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Limited partners               |   |                     | 169,320 |   |   |   | 602,041 |   |   |   | 450,408 |   |   |   | 485,903 |   |   |   | 468,795 |   |
|                           |   |                     |    |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Limited partners’        |   |                     |    |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| net income per unit            |   |                     | 15.55   |   |   |   | 55.29 |   |   |   | 41.36 |   |   |   | 44.62 |   |   |   | 43.05 |   |
|                           |   |                     |    |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Limited partners'              |   |                     |    |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| cash distributions per unit    |   |                     | 16.88   |   |   |   | 67.22 |   |   |   | 38.95 |   |   |   | 52.63 |   |   |   | 38.85 |   |
|                           |   |                     |    |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Total assets                   |   | $                        | 498,798 |   |   | $ | 539,804 |   |   | $ | 678,373 |   |   | $ | 619,464 |   |   | $ | 589,341 |   |
|                           |   |                     |    |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
|                           |   |                     |    |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
|                           |   |                     |    |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
|                           |   |                     |    |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |

|   |
|--------|

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| Item 7. | Management's Discussion and Analysis of Financial Condition and Results of Operations |
|---------|---------------------------------------------------------------------------------------|

|   |
|--------|

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|                                      |   | Year Ended December 31, |    |
|-------------------------------------------|--------|-------------------------|---------|
|                                      |   | 2009                    |    |   | 2008 |   |   | 2007 |   |
| Oil production in barrels                 |   |                    | 10,444  |   |   |   | 10,022 |   |   |   | 10,718 |   |
| Gas production in mcf                     |   |                    | 30,526  |   |   |   | 31,501 |   |   |   | 39,715 |   |
| Total (BOE)                               |   |                    | 15,532  |   |   |   | 15,272 |   |   |   | 17,337 |   |
| Average price per barrel of oil           |   | $                       | 57.15   |   |   | $ | 103.85 |   |   | $ | 71.50 |   |
| Average price per mcf of gas              |   | $                       | 4.59    |   |   | $ | 9.65 |   |   | $ | 7.22 |   |
| Partnership distributions                 |   | $                       | 204,618 |   |   | $ | 813,179 |   |   | $ | 471,542 |   |
| Limited partner distributions             |   | $                       | 183,819 |   |   | $ | 731,961 |   |   | $ | 424,149 |   |
| Per unit distribution to limited partners |   | $                       | 16.88   |   |   | $ | 67.22 |   |   | $ | 38.95 |   |
| Number of limited partner units           |   |                    | 10,889  |   |   |   | 10,889 |   |   |   | 10,889 |   |

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|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |   | Page   |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|--------|--------|
| Report of Independent Registered Public Accounting Firm                                                                                                    |   | 17     |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |   |   |
| Balance Sheets                                                                                                                                             |   | 18     |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |   |   |
| Statements of Operations                                                                                                                                   |   | 19     |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |   |   |
| Statements of Changes in Partners' Equity                                                                                                                  |   | 20     |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |   |   |
| Statements of Cash Flows                                                                                                                                   |   | 21     |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |   |   |
| Notes to Financial Statements                                                                                                                              |   | 22     |

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REPORT 

|   |
|--------|

----

Southwest 

|                                     |   | December 31, |      |
|------------------------------------------|--------|--------------|-----------|
|                                     |   | 2009         |      |   | 2008 |   |
| Assets                                   |   |         |      |   |   |   |
|                                     |   |         |      |   |   |   |
| Current assets:                          |   |         |      |   |   |   |
| Cash and cash equivalents                |   | $            | 54,536    |   |   | $ | 66,832 |   |
| Receivable from Managing General Partner |   |         | 86,237    |   |   |   | 8,370 |   |
| New Mexico income tax deposit            |   |         | 28,179    |   |   |   | 53,107 |   |
| Total current assets                     |   |         | 168,952   |   |   |   | 128,309 |   |
|                                     |   |         |      |   |   |   |   |   |
| Oil and gas properties - using the full- |   |         |      |   |   |   |   |   |
| cost method of accounting                |   |         | 4,267,893 |   |   |   | 4,308,340 |   |
| Less accumulated depreciation,           |   |         |      |   |   |   |   |   |
| depletion and amortization               |   |         | 3,938,047 |   |   |   | 3,896,845 |   |
| Net oil and gas properties               |   |         | 329,846   |   |   |   | 411,495 |   |
|                                     |   |         |      |   |   |   |   |   |
|                                     |   | $            | 498,798   |   |   | $ | 539,804 |   |
|                                     |   |         |      |   |   |   |   |   |
| Liabilities and Partners' Equity         |   |         |      |   |   |   |   |   |
|                                     |   |         |      |   |   |   |   |   |
| Asset retirement obligation              |   | $            | 295,569   |   |   | $ | 324,668 |   |
|                                     |   |         |      |   |   |   |   |   |
| Partners' equity:                        |   |         |      |   |   |   |   |   |
| General partners                         |   |         | 20,132    |   |   |   | 17,540 |   |
| Limited partners                         |   |         | 183,097   |   |   |   | 197,596 |   |
| Total partners' equity                   |   |         | 203,229   |   |   |   | 215,136 |   |
|                                     |   |         |      |   |   |   |   |   |
|                                     |   | $            | 498,798   |   |   | $ | 539,804 |   |

|   |
|--------|

----

Southwest 

|                                     |   | Years ended December 31, |    |
|------------------------------------------|--------|--------------------------|---------|
|                                     |   | 2009                     |    |   | 2008 |   |   | 2007 |   |
| Revenues                                 |   |                     |    |   |   |   |   |   |   |
| Oil and gas income                       |   | $                        | 736,893 |   |   | $ | 1,344,811 |   |   | $ | 1,053,193 |   |
| Interest income                          |   |                     | 108     |   |   |   | 1,286 |   |   |   | 1,612 |   |
| Other income                             |   |                     | 141     |   |   |   | 14 |   |   |   | - |   |
|                                     |   |                     | 737,142 |   |   |   | 1,346,111 |   |   |   | 1,054,805 |   |
|                                     |   |                     |    |   |   |   |   |   |   |   |   |   |
| Expenses                                 |   |                     |    |   |   |   |   |   |   |   |   |   |
| Production                               |   |                     | 378,151 |   |   |   | 521,531 |   |   |   | 393,775 |   |
| Depreciation, depletion and amortization |   |                     | 41,202  |   |   |   | 32,479 |   |   |   | 32,865 |   |
| Accretion expense                        |   |                     | 27,314  |   |   |   | 20,912 |   |   |   | 27,737 |   |
| General and administrative               |   |                     | 97,764  |   |   |   | 98,646 |   |   |   | 96,323 |   |
|                                     |   |                     | 544,431 |   |   |   | 673,568 |   |   |   | 550,700 |   |
|                                     |   |                     |    |   |   |   |   |   |   |   |   |   |
| Net income                               |   | $                        | 192,711 |   |   | $ | 672,543 |   |   | $ | 504,105 |   |
|                                     |   |                     |    |   |   |   |   |   |   |   |   |   |
| Net income allocated to:                 |   |                     |    |   |   |   |   |   |   |   |   |   |
| Managing General Partner                 |   | $                        | 21,052  |   |   | $ | 63,452 |   |   | $ | 48,327 |   |
|                                     |   |                     |    |   |   |   |   |   |   |   |   |   |
| General Partner                          |   | $                        | 2,339   |   |   | $ | 7,050 |   |   | $ | 5,370 |   |
|                                     |   |                     |    |   |   |   |   |   |   |   |   |   |
| Limited partners                         |   | $                        | 169,320 |   |   | $ | 602,041 |   |   | $ | 450,408 |   |
|                                     |   |                     |    |   |   |   |   |   |   |   |   |   |
| Per limited partner unit                 |   | $                        | 15.55   |   |   | $ | 55.29 |   |   | $ | 41.36 |   |

|   |
|--------|

----

Southwest 

|                         |   | General  |    |   | Limited  |   |     |   |   |
|------------------------------|--------|----------|---------|--------|----------|--------|----------|--------|--------|
|                         |   | Partners |    |   | Partners |   |     | Total  |   |
|                         |   |     |    |   |     |   |     |   |   |
| Balance at December 31, 2006 |   | $        | 21,952  |   |     | $      | 301,257  |   |   | $ | 323,209 |   |
|                         |   |     |    |   |     |   |     |   |   |   |   |   |
| Net income                   |   |     | 53,697  |   |     |   | 450,408  |   |   |   | 504,105 |   |
|                         |   |     |    |   |     |   |     |   |   |   |   |   |
| Distributions                |   |     | (47,393 | )      |     |   | (424,149 | )      |   |   | (471,542 | ) |
|                         |   |     |    |   |     |   |     |   |   |   |   |   |
| Balance at December 31, 2007 |   |     | 28,256  |   |     |   | 327,516  |   |   |   | 355,772 |   |
|                         |   |     |    |   |     |   |     |   |   |   |   |   |
| Net income                   |   |     | 70,502  |   |     |   | 602,041  |   |   |   | 672,543 |   |
|                         |   |     |    |   |     |   |     |   |   |   |   |   |
| Distributions                |   |     | (81,218 | )      |     |   | (731,961 | )      |   |   | (813,179 | ) |
|                         |   |     |    |   |     |   |     |   |   |   |   |   |
| Balance at December 31, 2008 |   |     | 17,540  |   |     |   | 197,596  |   |   |   | 215,136 |   |
|                         |   |     |    |   |     |   |     |   |   |   |   |   |
| Net income                   |   |     | 23,391  |   |     |   | 169,320  |   |   |   | 192,711 |   |
|                         |   |     |    |   |     |   |     |   |   |   |   |   |
| Distributions                |   |     | (20,799 | )      |     |   | (183,819 | )      |   |   | (204,618 | ) |
|                         |   |     |    |   |     |   |     |   |   |   |   |   |
| Balance at December 31, 2009 |   | $        | 20,132  |   |     | $      | 183,097  |   |   | $ | 203,229 |   |

|   |
|--------|

----

Southwest 

|                                                       |   | Years ended December 31, |     |
|------------------------------------------------------------|--------|--------------------------|----------|
|                                                       |   | 2009                     |     |   | 2008 |   |   | 2007 |   |
| Cash flows from operating activities:                      |   |                     |     |   |   |   |   |   |   |
| Cash received from oil and gas sales                       |   | $                        | 683,954  |   |   | $ | 1,470,519 |   |   | $ | 1,001,215 |   |
| Cash paid for production expense, administrative           |   |                     |     |   |   |   |   |   |   |   |   |   |
| fees and general and administrative overhead               |   |                     | (488,262 | ) |   |   | (632,728 | ) |   |   | (491,580 | ) |
| Interest received                                          |   |                     | 108      |   |   |   | 1,286 |   |   |   | 1,612 |   |
| Other income                                               |   |                     | 141      |   |   |   | 14 |   |   |   | 3,456 |   |
|                                                       |   |                     |     |   |   |   |   |   |   |   |   |   |
| Net cash provided by operating activities                  |   |                     | 195,941  |   |   |   | 839,091 |   |   |   | 514,703 |   |
|                                                       |   |                     |     |   |   |   |   |   |   |   |   |   |
| Cash flows used in investing activities:                   |   |                     |     |   |   |   |   |   |   |   |   |   |
| Additions to oil and gas properties                        |   |                     | (3,619   | ) |   |   | (6,496 | ) |   |   | (4,210 | ) |
|                                                       |   |                     |     |   |   |   |   |   |   |   |   |   |
| Cash flows used in financing activities:                   |   |                     |     |   |   |   |   |   |   |   |   |   |
| Distributions to partners                                  |   |                     | (204,618 | ) |   |   | (813,179 | ) |   |   | (471,542 | ) |
|                                                       |   |                     |     |   |   |   |   |   |   |   |   |   |
| Net (decrease) increase in cash and cash equivalents       |   |                     | (12,296  | ) |   |   | 19,416 |   |   |   | 38,951 |   |
|                                                       |   |                     |     |   |   |   |   |   |   |   |   |   |
| Beginning of year                                          |   |                     | 66,832   |   |   |   | 47,416 |   |   |   | 8,465 |   |
|                                                       |   |                     |     |   |   |   |   |   |   |   |   |   |
| End of year                                                |   | $                        | 54,536   |   |   | $ | 66,832 |   |   | $ | 47,416 |   |
|                                                       |   |                     |     |   |   |   |   |   |   |   |   |   |
| Reconciliation of net income to net                        |   |                     |     |   |   |   |   |   |   |   |   |   |
| cash provided by operating activities:                     |   |                     |     |   |   |   |   |   |   |   |   |   |
|                                                       |   |                     |     |   |   |   |   |   |   |   |   |   |
| Net income                                                 |   | $                        | 192,711  |   |   | $ | 672,543 |   |   | $ | 504,105 |   |
|                                                       |   |                     |     |   |   |   |   |   |   |   |   |   |
| Adjustments to reconcile net income to                     |   |                     |     |   |   |   |   |   |   |   |   |   |
| net cash provided by operating activities:                 |   |                     |     |   |   |   |   |   |   |   |   |   |
| Depreciation, depletion and amortization                   |   |                     | 41,202   |   |   |   | 32,479 |   |   |   | 32,865 |   |
| Accretion expense                                          |   |                     | 27,314   |   |   |   | 20,912 |   |   |   | 27,737 |   |
| Settlement of asset retirement obligations                 |   |                     |     |   |   |   |   |   |   |   |   |   |
| for plugged and abandoned wells                            |   |                     | (12,347  | ) |   |   | (12,551 | ) |   |   | (1,482 | ) |
| (Increase) decrease in receivables and deposits            |   |                     | (52,939  | ) |   |   | 125,708 |   |   |   | (48,522 | ) |
|                                                       |   |                     |     |   |   |   |   |   |   |   |   |   |
| Net cash provided by operating activities                  |   | $                        | 195,941  |   |   | $ | 839,091 |   |   | $ | 514,703 |   |
|                                                       |   |                     |     |   |   |   |   |   |   |   |   |   |
| Noncash investing and financing activities:                |   |                     |     |   |   |   |   |   |   |   |   |   |
| (Decrease) increase in oil and gas properties  - |   |                     |     |   |   |   |   |   |   |   |   |   |
| Asset retirement obligations                               |   | $                        | (44,066  | ) |   | $ | (6,294 | ) |   | $ | 91 |   |

|   |
|--------|

----

Southwest 

| 1. | Organization |
|----|--------------|

|                                                                | Limited  |   | General  |
|---------------------------------------------------------------------|----------|--------|----------|
|                                                                | Partners |   | Partners |
| Interest income on capital contributions                            | 100%     |   | -        |
| Oil and gas sales                                                   | 90%      |   | 10%      |
| All other revenues                                                  | 90%      |   | 10%      |
| Organization and offering costs (1)                                 | 100%     |   | -        |
| Amortization or organization costs                                  | 100%     |   | -        |
| Property acquisition costs                                          | 100%     |   | -        |
| Gain/loss on property disposition                                   | 90%      |   | 10%      |
| Operating and administrative costs (2)                              | 90%      |   | 10%      |
| Depreciation, depletion, and amortization of oil and gas properties | 100%     |   | -        |
| All other costs                                                     | 90%      |   | 10%      |

|   | (1) | All organization costs in excess of 3% of initial capital contributions will be paid by the Managing General Partner and will be treated as a capital contribution.  The Partnership paid the Managing General Partner an amount equal to 3% of initial capital contributions for such organization costs. |
|--------|-----|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

|   | (2) | Administrative costs in any year, which exceed 2% of capital contributions shall be paid by the Managing General Partner and will be treated as a capital contribution. |
|--------|-----|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| 2. | Summary of Significant Accounting Policies |
|----|--------------------------------------------|

|   |
|--------|

----

| 2. | Summary of Significant Accounting Policies- continued |
|----|-------------------------------------------------------|

|   |
|--------|

----

| 2. | Summary of Significant Accounting Policies- continued |
|----|-------------------------------------------------------|

|                                                        |   | 2009   |    |   | 2008   |   |
|-------------------------------------------------------------|--------|--------|---------|--------|--------|--------|
| Beginning of year                                           |   | $      | 324,668 |   |   | $      | 322,601 |   |
| Reduction of obligations due to wells plugged and abandoned |   |   | (12,347 | )      |   |   | (12,551 | ) |
| Accretion expense                                           |   |   | 27,314  |   |   |   | 20,912 |   |
| Revisions of previous estimates                             |   |   | (44,066 | )      |   |   | (6,294 | ) |
| End of year                                                 |   | $      | 295,569 |   |   | $      | 324,668 |   |

|   |
|--------|

----

| 4. | Commitments and Contingent Liabilities |
|----|----------------------------------------|

| 5. | Related Party Transactions |
|----|----------------------------|

|   |
|--------|

----

| 6. | Oil and Gas Reserves Information (unaudited) |
|----|----------------------------------------------|

| ·   | amends the definition of proved reserves to require the use of average commodity prices based upon the prior 12-month period rather than year-end prices; |
|--------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------|

| ·   | expands the type of technologies available to establish reserve estimates and categories; |
|--------------------|-------------------------------------------------------------------------------------------|

| ·   | modifies certain definitions used in estimating proved reserves; |
|--------------------|------------------------------------------------------------------|

| ·   | permits disclosure of probable and possible reserves; and |
|--------------------|-----------------------------------------------------------|

| ·   | permits disclosure of reserves based on different price and cost criteria, such as futures prices or management forecasts. |
|--------------------|----------------------------------------------------------------------------------------------------------------------------|

|                            |   | Oil (bbls) |    |   | Gas (mcf) |   |
|---------------------------------|--------|------------|---------|--------|-----------|--------|
| Total Proved -                  |   |       |    |   |      |   |
|                            |   |       |    |   |      |   |
| January 1, 2007                 |   |       | 145,000 |   |      |   | 306,000 |   |
|                            |   |       |    |   |      |   |   |   |
| Revisions of previous estimates |   |       | 17,000  |   |      |   | 69,000 |   |
| Production                      |   |       | (11,000 | )      |      |   | (40,000 | ) |
|                            |   |       |    |   |      |   |   |   |
| December 31, 2007               |   |       | 151,000 |   |      |   | 335,000 |   |
|                            |   |       |    |   |      |   |   |   |
| Revisions of previous estimates |   |       | (55,000 | )      |      |   | (55,000 | ) |
| Production                      |   |       | (10,000 | )      |      |   | (32,000 | ) |
|                            |   |       |    |   |      |   |   |   |
| December 31, 2008               |   |       | 86,000  |   |      |   | 248,000 |   |
|                            |   |       |    |   |      |   |   |   |
| Revisions of previous estimates |   |       | 13,000  |   |      |   | (53,000 | ) |
| Production                      |   |       | (10,000 | )      |      |   | (31,000 | ) |
|                            |   |       |    |   |      |   |   |   |
| December 31, 2009               |   |       | 89,000  |   |      |   | 164,000 |   |
|                            |   |       |    |   |      |   |   |   |
| Proved developed reserves -     |   |       |    |   |      |   |   |   |
| December 31, 2007               |   |       | 124,000 |   |      |   | 227,000 |   |
| December 31, 2008               |   |       | 67,000  |   |      |   | 150,000 |   |
| December 31, 2009               |   |       | 70,000  |   |      |   | 145,000 |   |

|   |
|--------|

----

| 6. | Oil and Gas Reserves Information (unaudited) - continued |
|----|----------------------------------------------------------|

|                                          |   | 2009   |      |   | 2008   |   |      | 2007   |   |
|-----------------------------------------------|--------|--------|-----------|--------|--------|--------|-----------|--------|--------|
| Future cash inflows                           |   | $      | 5,316,000 |   |   | $      | 5,167,000 |   |   | $ | 15,907,000 |   |
| Production, development and abandonment costs |   |   | 3,547,000 |   |   |   | 3,190,000 |   |   |   | 5,897,000 |   |
| Future net cash flows                         |   |   | 1,769,000 |   |   |   | 1,977,000 |   |   |   | 10,010,000 |   |
| 10% annual discount for estimated             |   |   |      |   |   |   |      |   |   |   |   |   |
| timing of cash flows                          |   |   | 642,000   |   |   |   | 776,000   |   |   |   | 4,587,000 |   |
| Standardized measure of discounted            |   |   |      |   |   |   |      |   |   |   |   |   |
| future net cash flows                         |   | $      | 1,127,000 |   |   | $      | 1,201,000 |   |   | $ | 5,423,000 |   |

|   |
|--------|

----

| 6. | Oil and Gas Reserves Information (unaudited) - continued |
|----|----------------------------------------------------------|

|                                                   |   | 2009   |      |   | 2008   |   |       | 2007   |   |
|--------------------------------------------------------|--------|--------|-----------|--------|--------|--------|------------|--------|--------|
| Sales of oil and gas produced, net of production costs |   | $      | (359,000  | )      |   | $      | (824,000   | )      |   | $ | (659,000 | ) |
| Changes in prices and production costs                 |   |   | 53,000    |   |   |   | (3,614,000 | )      |   |   | 2,102,000 |   |
| Changes of production rates (timing) and others        |   |   | 71,000    |   |   |   | 279,000    |   |   |   | (186,000 | ) |
| Revisions of previous quantities estimates             |   |   | 41,000    |   |   |   | (605,000   | )      |   |   | 747,000 |   |
| Accretion of discount                                  |   |   | 120,000   |   |   |   | 542,000    |   |   |   | 311,000 |   |
| Discounted future net cash flows -                     |   |   |      |   |   |   |       |   |   |   |   |   |
| Beginning of year                                      |   |   | 1,201,000 |   |   |   | 5,423,000  |   |   |   | 3,108,000 |   |
| End of year                                            |   | $      | 1,127,000 |   |   | $      | 1,201,000  |   |   | $ | 5,423,000 |   |

|                  |   | Quarter |    |
|-----------------------|--------|---------|---------|
|                  |   | First   |    |   | Second |   |   | Third |   |   | Fourth |   |
| 2009:                 |   |    |    |   |   |   |   |   |   |   |   |   |
| Total revenues        |   | $       | 116,307 |   |   | $ | 180,303 |   |   | $ | 215,769 |   |   | $ | 224,763 |   |
| Total expenses        |   |    | 157,092 |   |   |   | 123,317 |   |   |   | 134,758 |   |   |   | 129,264 |   |
| Net (loss) income     |   | $       | (40,785 | ) |   | $ | 56,986 |   |   | $ | 81,011 |   |   | $ | 95,499 |   |
|                  |   |    |    |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Net (loss) income per |   |    |    |   |   |   |   |   |   |   |   |   |   |   |   |   |
| limited partners unit |   | $       | (3.48   | ) |   | $ | 4.62 |   |   | $ | 6.61 |   |   | $ | 7.80 |   |

|                  |   | Quarter |    |
|-----------------------|--------|---------|---------|
|                  |   | First   |    |   | Second |   |   | Third |   |   | Fourth |   |
| 2008:                 |   |    |    |   |   |   |   |   |   |   |   |   |
| Total revenues        |   | $       | 359,422 |   |   | $ | 441,453 |   |   | $ | 431,676 |   |   | $ | 113,560 |   |
| Total expenses        |   |    | 138,586 |   |   |   | 181,512 |   |   |   | 180,685 |   |   |   | 172,785 |   |
| Net income (loss)     |   | $       | 220,836 |   |   | $ | 259,941 |   |   | $ | 250,991 |   |   | $ | (59,225 | ) |
|                  |   |    |    |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Net income (loss) per |   |    |    |   |   |   |   |   |   |   |   |   |   |   |   |   |
| limited partners unit |   | $       | 18.18   |   |   | $ | 21.41 |   |   | $ | 20.66 |   |   | $ | (4.96 | ) |

|   |
|--------|

----

Item 

Item 

|   |
|--------|

----

Item 

|   |
|--------|

----

Item 

Item 

|   |
|--------|

----

Item 

Item 

Item 

| For the Year Ended December 31, |   | 2009   |   |   | 2008   |   |
|---------------------------------|--------|--------|--------|--------|--------|--------|
| Audit Fees                      |   | $      | 17,163 |   |   | $      | 18,030 |   |
| Audit Related Fees              |   |   | -      |   |   |   | - |   |
| Tax Fees                        |   |   | -      |   |   |   | - |   |
| All Other Fees                  |   |   | -      |   |   |   | - |   |
|                            |   |   |   |   |   |   |   |   |
| TOTAL                           |   | $      | 17,163 |   |   | $      | 18,030 |   |

|   |
|--------|

----

Item 

| (a)    | (1)    | Financial Statements:                                                                                                                                                                                |
|--------|--------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
|   |   |                                                                                                                                                                                                 |
|   |   | Included in Part II of this report                                                                                                                                                                   |
|   |   |                                                                                                                                                                                                 |
|   |   | Report of Independent Registered Public Accounting Firm                                                                                                                                              |
|   |   | Balance Sheets                                                                                                                                                                                       |
|   |   | Statements of Operations                                                                                                                                                                             |
|   |   | Statements of Changes in Partners' Equity                                                                                                                                                            |
|   |   | Statements of Cash Flows                                                                                                                                                                             |
|   |   | Notes to Financial Statements                                                                                                                                                                        |
|   |   |                                                                                                                                                                                                 |
|   | (2)    | Schedules required by Article 12 of Regulation S-X are either omitted because they are not applicable or because the required information is shown in the financial statements or the notes thereto. |
|   |   |                                                                                                                                                                                                 |
|   | (3)    | Exhibits:                                                                                                                                                                                            |

| 4      | (a)    | Certificate of Limited Partnership of Southwest Oil & Gas Income Fund X-B, L.P., dated November 27, 1990.  (Incorporated by reference from Partnership's Form 10-K for the fiscal year ended December 31, 1990.) |
|--------|--------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
|   |   |                                                                                                                                                                                                                           |
|   | (b)    | Agreement of Limited Partnership of Southwest Oil & Gas Income Fund X-B, L.P. dated November 27, 1990.  (Incorporated by reference from Partnership's Form 10-K for the fiscal year ended December 31, 1991.)    |
|   |   |                                                                                                                                                                                                                           |
|   | 31.1   | Rule 13a-14(a)/15d-14(a) Certification                                                                                                                                                                                         |
|   | 31.2   | Rule 13a-14(a)/15d-14(a) Certification                                                                                                                                                                                         |
|   | 32.1   | Certification of Chief Executive Officer and Chief Financial Officer Pursuant to 18 U.S.C. Section 1350, as adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002                                                  |

|   |
|--------|

----

Glossary 

|   |
|--------|

----

|   |
|--------|

----

Signatures

|   | Southwest Oil & Gas Income Fund X-B, L.P., |
|--------|------------------------------------------------|
|   | a Delaware limited partnership            |
|   |                                           |
| By:    | Southwest Royalties, Inc., Managing            |
|   | General Partner                                |
|   |                                           |
|   |                                           |
| By:    | /s/ L. Paul Latham                             |
|   | L. Paul Latham                                 |
|   | President and Chief Executive Officer          |
|   |                                           |
| Date:  | March 31, 2010                                 |

|                                                                                  |   |                                                                                  |
|---------------------------------------------------------------------------------------|--------|---------------------------------------------------------------------------------------|
| /s/ Clayton W Williams                                                                |   | /s/ L. Paul Latham                                                                    |
| Clayton W. Williams, Chairman of the Board                                            |   | L. Paul Latham, President and a Director                                              |
| and a Director                                                                        |   |                                                                                  |
|                                                                                  |   |                                                                                  |
| Date:           March 31, 2010 |   | Date:           March 31, 2010 |
|                                                                                  |   |                                                                                  |
|                                                                                  |   |                                                                                  |
|                                                                                  |   |                                                                                  |
|                                                                                  |   |                                                                                  |
| /s/ Mel G. Riggs                                                                      |   |                                                                                  |
| Mel G. Riggs, Vice President – Finance,                                         |   |                                                                                  |
| Treasurer and a Director                                                              |   |                                                                                  |
|                                                                                  |   |                                                                                  |
| Date:           March 31, 2010 |   |                                                                                  |
|                                                                                  |   |                                                                                  |
|                                                                                  |   |                                                                                  |