Columbia subject headings:
Energy industries--Law and legislation--Mexico.
Petroleum law and legislation--Mexico.
Harvard subject headings:
Energy policy--Mexico--Congresses.
Petroleum industry and trade--Government policy--Mexico--Congresses.
Petroleum industry and trade--Mexico--Congresses.
Princeton subject headings:
Energy policy--Mexico--Congresses.
Petroleum industry and trade--Government policy--Mexico--Congresses.
Petroleum industry and trade--Mexico--Congresses.