Document:

<PAGE>
                                                                    Exhibit 10.1

                           LOAN MODIFICATION AGREEMENT

         This Loan Modification Agreement (hereinafter "Agreement") is entered
into this 28th day of August, 2001, by and between Bank One, N.A. (hereinafter
"Bank One"), successor in interest to Bank One, Youngstown, N.A. (hereinafter
"Bank One, Youngstown") successor in interest to Bank One, Texas, N.A.
(hereinafter "Bank One, Texas") and Everflow Eastern, Inc. and Everflow Eastern
Partners, L.P. (hereinafter collectively referred to as "Borrowers").

         WHEREAS, on or about January 19, 1995 the Borrowers entered into a
Credit Agreement with Bank One, Texas. Pursuant to the Credit Agreement, Bank
One, Texas extended credit to Borrowers in the total principal amount of Seven
Million and 00/100 Dollars ($7,000,000.00) (hereinafter "Credit"), pursuant to
which Borrowers jointly and severally executed a Promissory Note in the
principal amount of Seven Million and 00/100 Dollars ($7,000,000.00) dated
January 19, 1995.

         WHEREAS, on or about January 25, 1995, Bank One, Texas and Bank One,
Youngstown entered into a Participation Agreement with respect to the Credit,
whereby Bank One, Youngstown participated with Bank One, Texas with respect to
the Credit.

         WHEREAS, on or about June 16, 1997, Bank One, Texas, Bank One,
Youngstown and Borrowers entered into a Loan Modification Agreement whereby Bank
One, Youngstown became the sole lender with respect to the Credit.

         WHEREAS, on or about May 29, 1998, Bank and Borrowers entered into a
certain Loan Modification Agreement whereby Bank, NA amended the Commitment
Termination Date to May 31, 1999.

          WHEREAS, on or about May 25, 1999, Bank One and Borrowers entered into
a certain Loan Modification Agreement whereby the commitment termination date
was extended until May 31, 2001.

         WHEREAS, on or about September 19, 2000, Bank One and Borrowers entered
into a certain Loan Modification Agreement whereby the commitment termination
date was extended until May 31, 2002 and the commitment was reduced to an
aggregate principal amount of Four Million Dollars ($4,000,000.00).

         WHEREAS, the parties have agreed to modify the terms and conditions set
forth in the Credit Agreement and Promissory Note.

<PAGE>

         NOW THEREFORE, for mutual consideration and intending to be legally
bound hereby, the parties hereto agree as follows:

         1. MODIFICATION OF OTHER DOCUMENTS. The terms and conditions set forth
in the Credit Agreement, Promissory Note and prior Loan Modification Agreements
shall remain in full force and effect except as expressly modified herein.

         2. COMMITMENT TERMINATION DATE. The Promissory Note and Credit
Agreement are hereby modified to provide that the outstanding balance of
principal, interest and other charges due pursuant to the Promissory Note,
Credit Agreement and prior Loan Modification Agreements shall be due and payable
in full on or before May 31, 2003. All other payments of interest or other
amounts provided for in the Promissory Note and/or Credit Agreement shall
continue to be due and owing in accordance with the terms of the Promissory Note
and/or Credit Agreement, except for as otherwise modified herein.

         3. GOVERNING LAW/VENUE. This Agreement shall be governed by, construed
and enforced in accordance with the laws of the State of Ohio, and the venue for
any legal action commenced in connection with this transaction, the Promissory
Note, the Credit Agreement and/or the prior Loan Modification Agreements shall
be the Courts of Mahoning County, Ohio.

         4. SEGREGATION. The invalidity of any portion of this Agreement will
not and shall not be deemed to affect the validity of any other provision. In
the event that any provision of this Agreement is held to be invalid, the
parties agree that the remaining provisions shall be deemed to be in full force
and effect as if they had been executed by all parties subsequent to the
expungement of the invalid provision. This clause shall also be applicable to
any documents executed in connection herewith.

         5. INTEGRATION. This Agreement, the Promissory Note, as modified, the
Credit Agreement, as modified, and the Loan Modification Agreement constitute
the entire Agreement between the parties with respect to the subject hereof, and
any prior understanding or representation of any kind shall not be binding upon
any party hereto.

         6. MODIFICATION. Any modification of this Agreement or any Related
Documents shall be binding only if placed in writing and signed by the parties
hereto with the same formality as this Agreement, the Promissory Note, the
Credit Agreement and/or the prior Loan Modification Agreement.

<PAGE>

          7. EFFECTIVE TIME OF AGREEMENT. This Agreement shall remain in full
force and effect until the Credit, including any extensions, modifications,
and/or renewals thereof, and any additional amounts due from Borrowers to Bank,
under this Agreement, the Promissory Note, the Credit Agreement and/or Loan
Modification Agreement, including any extensions, modifications and/or renewals
thereof, are paid in full.

          8. PARAGRAPH HEADINGS.  The titles to the paragraphs of this Agreement
are solely for the convenience of the parties, and any ambiguity between the
language and the heading, if any shall be resolved in favor of the
language of the paragraph, without consideration of the language of the
heading.

          9. SUCCESSORS AND ASSIGNS.  This Agreement shall be binding upon
Borrowers, their successors and, subject to Paragraph Ten (10) of this
Agreement, assigns.

          10. ASSIGNMENT. This Agreement, the Promissory Note, the Credit
Agreement and/or Loan Modification Agreement are not assignable by Borrowers
without Bank's prior written consent, and any attempt by borrowers to assign
this Agreement, the Promissory Note, the Credit Agreement and/or Loan
Modification Agreement without the prior written consent of Bank shall be deemed
void. Bank may make such an assignment at any time without consent or other
limitation.

          11. FURTHER ACTION. Borrowers will, upon request of Bank execute any
other documents and take any other action deemed by Bank necessary or
appropriate in connection with this Agreement.

          NOW THEREFORE, this Agreement is entered into by the parties hereto on
the day and year written above.

Bank:                                     Borrower:

Bank One, NA                              Everflow Eastern Partners, L.P.
                                          through its General Partner, Everflow
By:  /s/ Richard J. Lis                   Management Company, through its
    ---------------------------           Managing General Partner, Everflow
    Richard J. Lis,                       Management Corporation.
    Vice President
                                          By: /s/ William A. Siskovic
                                              ----------------------------------

                                          Everflow Eastern, Inc.

                                          By:  /s/ William A. Siskovic
                                             -----------------------------------
                                                William A. Siskovic<PAGE>
                                                                   Exhibit 10.10

                                   NATIONWIDE
                      OFFICE OF INVESTMENTS INCENTIVE PLAN

In order to enable Office of Investments to attract, motivate and retain the
human talent necessary to achieve its business objectives, Nationwide hereby
amends and restates the Office of Investments Incentive Plan (the "Plan") as of
November 12, 2001, upon the following terms and conditions:

1.       DEFINITIONS. The capitalized terms used herein shall have the following
         meanings:

          (a)  "Award Year" shall mean the calendar/fiscal year for which the
               Incentive Award is paid;

          (b)  "Participant" shall mean each member of the staff of the Office
               of Investments whose position is identified for participation in
               and who has been notified of her/his eligibility for
               participation in the Plan for the Award Year;

          (c)  "Incentive Award" shall mean the amount payable to an individual
               Participant in an Award Year, based on the achievement and
               surpassing of the performance goals pursuant to Section 4 hereof;

          (d)  "Business Unit" shall mean the Office of Investments;

          (e)  "Business Unit Award Fund" shall mean the funds available to be
               allocated to Participants within Business Unit based on Business
               Unit's performance during the Award Year;

          (f)  "Business Unit Chief Officer" shall mean the most senior
               Nationwide officer whose sole responsibility is the operations of
               the Business Unit.

          (g)  "Total Value Added" shall mean the total risk adjusted spread on
               a net present value basis for all investments, adjusted for
               expenses and credit experience in each period. The reported Value
               Added is a blend of the current year and the preceding years when
               computed, such that the current year has a weighting of
               approximately half the overall performance with the prior years
               comprising the other half.

                                       1

                                                                       11/12/01
<PAGE>
                                                                   Exhibit 10.10

                                   NATIONWIDE
                      OFFICE OF INVESTMENTS INCENTIVE PLAN

         (h)      "Nationwide" shall mean Farmland Mutual Insurance Company,
                  Nationwide Financial Services, Inc., Nationwide Mutual
                  Insurance Company, Nationwide Mutual Fire Insurance Company,
                  Scottsdale Insurance Company, and all subsidiaries of any of
                  such companies;

         (i)      "Plan Administrator" shall mean the individual(s) formally
                  designated by the Business Unit Chief Officer to be
                  responsible for the administration and implementation of the
                  Plan.

         All titles used herein and not otherwise defined hereby shall have the
         same meaning given to them in the Nationwide organization charts and in
         its normal course of business.

2.       EFFECTIVE DATE. The Plan shall become effective as of January 1, 2001,
         and shall continue in effect until December 31, 2001, unless terminated
         as set forth herein. The Plan shall supersede any and all prior
         Business Unit incentive compensation programs except as detailed
         herein. The Plan must be annually reviewed and approved for
         continuation.

3.       ABSOLUTE DISCRETION. The Chairman and Chief Executive Officer of
         Nationwide or the Business Unit Chief Officer shall have sole and
         absolute discretion over all aspects of the Plan, including but not
         limited to the final determination of Incentive Awards and amounts.
         Determinations of such individuals shall be conclusive and binding on
         all parties.

4.       DETERMINATION OF INCENTIVE AWARDS. Incentive Awards for the Award Year
         are determined in the following manner:

         (a)  The Business Unit Award Fund shall be equal to the amount
              determined based on the Office of Investments performance
              scorecard set forth in per attachments I - II.

(b)           Incentive Awards are based primarily on, but not limited to; an
              assessment of the Participant's achievement of assigned
              performance objectives, and the Participant's compliance with
              applicable laws, statutes, regulations, and Nationwide and
              Business Unit policies, practices, and procedures. The amount of
              each Incentive Award shall be approved by the Business Unit Chief
              Officer in his or her sole discretion. The total of all Incentive
              Awards shall not exceed the Business Unit Award Fund.

                                       2
                                                                        11/12/01
<PAGE>
                                                                   Exhibit 10.10

                                   NATIONWIDE
                      OFFICE OF INVESTMENTS INCENTIVE PLAN

         (c) Not withstanding the foregoing, Participants on a written final
             warning stage of a performance plan at the time of the bonus payout
             will not receive a payout.

5.       PAYMENT OF INDIVIDUAL INCENTIVE AWARDS. Incentive Awards, if awarded,
         are due and payable not later than March 15 of the calendar year
         following the Award Year.

6.       FORFEITURE. Any Participant whose employment with Nationwide is
         terminated, whether voluntarily or otherwise, prior to the end of the
         Award Year, shall forfeit any and all rights to an Incentive Award;
         except:

         a)   Where the Participant has terminated active employment with
              Nationwide during the Award Year as a result of the Participant's
              death,

         b)   Where the Participant has terminated active employment with
              Nationwide due to retirement during an Award Year, or

         c)   Where the Participant has involuntarily terminated active
              employment with Nationwide and is entitled to benefits under the
              Severance Pay Plan maintained by his or her employer, or would
              have been entitled to such benefits in the absence of an offer of
              Suitable Replacement Employment as defined in such Severance Pay
              Plan.

         In the event of a termination of employment described in paragraphs a)
         through c) above, the Participant shall receive a prorata portion of
         the Incentive Award that he or she would have received if employment
         had continued through the end of the Award Year, based on the
         percentage of the Award Year represented by the period of service
         completed prior to the termination of employment.

         A Participant shall also forfeit a portion or all of his or her
         Incentive Award in the event he or she fails to provide services to
         Nationwide for any portion of an Award Year as a result of a paid or
         unpaid leave of absence or disability of more than one month. The
         Participant shall receive a prorata portion of the Incentive Award that
         he or she would have received if provided services throughout the Award
         Year, based on the percentage of the Award Year for which services were
         actually performed for Nationwide by the Participant.

                                       3
                                                                        11/12/01
<PAGE>
                                                                   Exhibit 10.10

                                   NATIONWIDE
                      OFFICE OF INVESTMENTS INCENTIVE PLAN

7.       REVIEW PROCEDURES. The Plan Administrator shall prepare all
         calculations made under the Plan. The Finance unit providing services
         to the Business Unit shall review a representative sample of the
         calculations made under the Plan and other information incidental
         thereto, and reconcile calculations and other information with Business
         Unit performance reports. Reviews will be conducted on an annual basis.
         Review findings will be discussed with the Plan Administrator and
         communicated by Business Unit Finance to the Business Unit Chief
         Officer.

8.       AMENDMENTS; TERMINATIONS. Chairman and Chief Executive Officer of
         Nationwide or Business Unit Chief Officer may periodically review,
         modify and/or terminate the Plan at any time.

9.       EMPLOYMENT. Nothing in the Plan shall interfere with or limit in any
         way the right of the Business Unit or Nationwide to terminate any
         Participant's employment at any time, nor confer upon any Participant
         any right to continue in the employ of the Business Unit or Nationwide.

10.      OTHER PLAN PARTICIPATION. Participants are eligible to participate in
         the Performance Incentive Plan (PIP). However; Participants in the Plan
         are ineligible to simultaneously participate in other Nationwide
         short-term variable reward plans. Eligibility for future short-term
         variable reward plans, if any, will be evaluated by the Business Unit
         Chief Officer.

11.      TRANSFER IN OR NEW HIRE. In the event an employee becomes a Participant
         after the beginning of the Award Year, the Participant will be eligible
         for a pro-rata Incentive Award based on the effective date of his or
         her employment and pursuant to Section 4 hereof.

12.      TRANSFER TO A NON-PARTICIPATING POSITION. In the event a Plan
         Participant transfers to a non-participating position within
         Nationwide, the Business Unit Chief Officer has the discretion to pay
         or not pay an Incentive Award. Any such award, if paid, shall be based
         on the portion of the Award Year during which the Participant held an
         eligible position

                                       4
                                                                        11/12/01
<PAGE>
                                                                   Exhibit 10.10

                                   NATIONWIDE
                      OFFICE OF INVESTMENTS INCENTIVE PLAN

13.      NONTRANSFERABILITY. No right or interest of any Participant in the Plan
         shall be assignable or transferable, or subject to any lien, directly,
         by operation of law or otherwise, including, but not limited to,
         execution, levy, garnishment, attachment, pledge, and bankruptcy

14.      BENEFICIARY DESIGNATION. Each Participant under the Plan may, from time
         to time, name any beneficiary or beneficiaries (who may be named
         contingently or successively) to whom any benefit under the Plan is to
         be paid in case of his or her death before he or she receives any or
         all of such benefit. Each designation will revoke all prior
         designations by the same Participant, shall be in a form prescribed by
         the Plan Administrator, and will be effective only when filed by the
         Participant in writing with the Plan Administrator during his or her
         lifetime. In the absence of any such designation, benefits remaining
         unpaid at the Participant's death shall be paid to the Participant's
         estate.

15.      GOVERNING LAW. The Plan shall be governed by and construed in
         accordance with the laws of the state of Ohio or other states as deemed
         applicable or appropriate.

16.      WITHHOLDING TAXES. The Company shall have the right to deduct from all
         payments under the Plan any federal, state, or local taxes required by
         law to be withheld with respect to such payments.

17.      GENDER AND NUMBER. Except where otherwise indicated by the context, any
         masculine term used herein also shall include the feminine; the plural
         shall include the singular, and the singular shall include the plural.

18.      SEVERABILITY. In the event any provision of the Plan shall be held
         illegal or invalid for any reason, the illegality or invalidity shall
         not affect the remaining parts of the Plan, and the Plan shall be
         construed and enforced as if the illegal or invalid provision had not
         been included.

19.      INTENT. The Plan is intended solely for the purpose of enabling
         Business Unit to achieve its business objectives and increase
         productivity by rewarding exceptional performance by Participants. The
         Plan shall not affect or impair any of the rules, policies or
         procedures of the Business Unit or Nationwide otherwise applicable to
         Participants.

                                       5
                                                                        11/12/01
<PAGE>
                                                                   Exhibit 10.10

                                   NATIONWIDE
                      OFFICE OF INVESTMENTS INCENTIVE PLAN

REVIEWED BY:

------------------------------------                ---------------------------
Mark S Bergstedt                                                          (Date)
Vice President Human Resources
Nationwide Financial Services

------------------------------------                ---------------------------
Robert A Oakley                                                           (Date)
EVP, Chief Financial Officer and Treasurer
Nationwide

------------------------------------                ---------------------------
Timothy K Werner                                                         (Date)
Officer Human Resources
Nationwide Performance and Rewards

APPROVED BY:

------------------------------------                ---------------------------
Robert J Woodward Jr                                                     (Date)
Executive Vice President and Chief Investment Officer
Nationwide

------------------------------------                ---------------------------
Donna A James                                                            (Date)
Executive Vice President and Chief Administrative Officer
Nationwide

------------------------------------                ---------------------------
William G. Jurgensen                                                     (Date)
Chief Executive Officer
Nationwide

                                       6
                                                                        11/12/01
<PAGE>
                                                                    ATTACHMENT I

                        NATIONWIDE OFFICE OF INVESTMENTS

                PERFORMANCE SCORECARD - PIP, SCALE = 0.0 TO 2.5

<TABLE>
<CAPTION>
<S>                                  <C>                <C>         <C>
                                       ---------               --------------------------------------------------------------------
                                        WEIGHT        TYPE            DNM                 M                 E                 FE
                                       ---------               --------------------------------------------------------------------
NATIONWIDE FINANCIAL                     58%
                                       ---------
GENERAL ACCOUNT FI                       50%                     0.00% to 0.19%    0.20% to 0.40%     0.41% to 0.60%  0.61% to 0.65%
        Total Value Added - Annualized                 TVA
* Target is based on an investable
   cash flow level of 20% of total assets.

MUTUAL FUNDS                              5%
     NMF BOND                                         GROR      (0.20%) to 0.00%   0.00% to 0.20%     0.21% to 0.40%   0.41 to 0.50%
        LB G/C

     NMF MONEY MARKET                                 GROR      (0.05%) to 0.00%   0.00% to 0.10%     0.10% to 0.15%   0.16 to 0.20%
        IBC Tier 1

     NMF TAX FREE                                     GROR      (0.20%) to 0.00%   0.00% to 0.20%     0.21% to 0.40%   0.41 to 0.50%
        LB Municipal

     NMF GOVT INTERM                                  GROR      (0.20%) to 0.00%   0.00% to 0.20%     0.21% to 0.40%   0.41 to 0.50%
        ML Govt Master

     NSAT GOVT                                        GROR      (0.20%) to 0.00%   0.00% to 0.20%     0.21% to 0.40%   0.41 to 0.50%
        ML Govt Master

     NSAT MONEY MARKET                                GROR      (0.05%) to 0.00%   0.00% to 0.10%     0.10% to 0.15%   0.16 to 0.20%
        IBC Tier 1

SEPARATE ACCOUNTS                         2%

     SEP ACCT OHIO                                    GROR      (0.20%) to 0.00%   0.00% to 0.20%     0.21% to 0.40%   0.41 to 0.50%
        Blended Index

     SEP ACCT B RETIREMENT                            GROR      (0.20%) to 0.00%   0.00% to 0.20%     0.21% to 0.40%   0.41 to 0.50%
        LB G/C

REAL ESTATE EQUITY                        1%

     RE PORTFOLIO                                      ROR      (100.0%) to 0.0%   0.0% to 100.0%    100.0% to 200.0%   200 to 300%
        Custom NCREIF

                                       ---------
NATIONWIDE INSURANCE                     42%
                                       ---------
MANAGED FIXED INCOME*                    30%                     0.00% to 0.15%    0.15% to 0.30%     0.30% to 0.45%   0.46 to 0.50%
        Tax Adjusted Value Added - Annualized          TVA

* Target is based on an investable cash
   flow level of 20% of total assets.

EQUITIES*                                10%                       65% to 50%        50% to 38%         37% to 26%      25% to 15%
        Equity Universe Rank                          RANK
* Includes separate account equity assets.

VENTURE CAPITAL*                          2%                       75% to 50%        50% to 35%         35% to 25%      24% to 15%
        VE Universe Rank (6 mo lag)                   RANK
* Commitment size and vintage year weighted ranking.
                                       ---------
TOTAL                                    100%
                                       ---------
</TABLE>

<PAGE>
                                                                   ATTACHMENT II

                        Nationwide Office of Investments

                 Performance Scorecard - OIP, Scale = 0.0 to 2.0

<TABLE>
<CAPTION>
                                                                                --------------------------------------------------
                                                 WEIGHT    RESULTS      TYPE            DNM              M                 E
                                                ----------                      --------------------------------------------------
<S>                                            <C>                     <C>      <C>               <C>               <C>

NATIONWIDE FINANCIAL                               58%
                                                ----------
General Account Fixed Income                       50%                            0.00% to 0.19%   0.20% to 0.40%   0.41% to 0.65%
         Total Value Added - Annualized                                 TVA
* Target is based on an investable cash
  flow level of 20% of total assets.

MUTUAL FUNDS                                       5%
      NMF BOND                                                          GROR     (0.20%) to 0.00%  0.00% to 0.20%   0.21% to 0.40%
         LB G/C

      NMF MONEY MARKET                                                  GROR     (0.05%) to 0.00%  0.00% to 0.10%   0.10% to 0.20%
         IBC Tier 1

      NMF TAX FREE                                                      GROR     (0.20%) to 0.00%  0.00% to 0.20%   0.21% to 0.40%
         LB Municipal

      NMF GOVT INTERM                                                   GROR     (0.20%) to 0.00%  0.00% to 0.20%   0.21% to 0.40%
         ML Govt Master

      NSAT GOVT                                                         GROR     (0.20%) to 0.00%  0.00% to 0.20%   0.21% to 0.40%
         ML Govt Master

      NSAT MONEY MARKET                                                 GROR     (0.05%) to 0.00%  0.00% to 0.10%   0.10% to 0.20%
         IBC Tier 1

SEPARATE ACCOUNTS                                  2%

      SEP ACCT OHIO                                                     GROR     (0.20%) to 0.00%  0.00% to 0.20%   0.21% to 0.40%
         Blended Index

      SEP ACCT B RETIREMENT                                             GROR     (0.20%) to 0.00%  0.00% to 0.20%   0.21% to 0.40%
         LB G/C

REAL ESTATE EQUITY                                 1%

      RE PORTFOLIO                                                      ROR      (100.0%) to 0.0%  0.0% to 100.0%  100.0% to 200.0%
         Custom NCREIF

                                                ----------
NATIONWIDE INSURANCE                               42%
                                                ----------
MANAGED FIXED INCOME*                              30%                            0.00% to 0.15%   0.15% to 0.30%   0.30% to 0.50%
         Tax Adjusted Value Added - Annualized                          TVA
* Target is based on an investable cash flow level of 20% of total assets.

EQUITIES*                                          10%                              65% to 50%       50% to 30%       30% to 15%
         Equity Universe Rank                                           RANK
* Includes separate account equity assets.

VENTURE CAPITAL*                                   2%                               75% to 50%       50% to 35%       35% to 25%
         Venture Economics Universe Rank (6 mo lag)                     RANK
* Commitment size and vintage year weighted ranking.
                                                ----------
TOTAL                                             100%

                                                ----------

</TABLE>

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