Columbia subject headings:
Oil and gas leases--United States--Accounting.
Oil and gas leases--United States--Auditing.
Oil and gas leases--United States.
United States. Department of the Interior.
Harvard subject headings:
Energy policy--United States
Fiscal policy--United States
Oil and gas leases--United States--Accounting.
Oil and gas leases--United States--Auditing.
United States. Department of the Interior--Accounting.
Princeton subject headings:
Oil and gas leases--United States--Accounting.
Oil and gas leases--United States--Auditing.