Columbia subject headings:
Oil fields--Valuation--California.
Oil fields--Valuation--United States.
Petroleum--Taxation--California.
Petroleum--Taxation--United States.
United States. Minerals Management Service.
Harvard subject headings:
Oil fields--Valuation--California.
Oil fields--Valuation--United States.
Petroleum--Taxation--California.
Petroleum--Taxation--United States
United States. Minerals Management Service.
Princeton subject headings: