Columbia subject headings:
Environmental law--Mexico.
Environmental protection--Mexico.
Petroleum industry and trade--Mexico--Environmental aspects.
Petroleum industry and trade--Mexico.
Petroleum law and legislation--Mexico.
Harvard subject headings:
Environmental law--Mexico
Natural resources--Law and legislation--Mexico.
Petroleum industry and trade--Environmental aspects--Mexico.
Petroleum law and legislation--Mexico.
Princeton subject headings:
Environmental law--Mexico.
Petroleum industry and trade--Mexico--Environmental aspects.
Petroleum law and legislation--Mexico.