Columbia subject headings:
Oil and gas leases--Venezuela.
Petroleum industry and trade--Government ownership--Venezuela.
Petroleum industry and trade--Venezuela.
Harvard subject headings:
Oil and gas leases--Venezuela.
Petroleum industry and trade--Government ownership--Venezuela
Petroleum industry and trade--Venezuela
Princeton subject headings:
Oil and gas leases--Venezuela.
Petroleum industry and trade--Government ownership--Venezuela.
Petroleum industry and trade--Venezuela.