Columbia subject headings:
Constitutional law--Mexico--Cases.
Eminent domain--Mexico.
Petroleum industry and trade--Mexico.
Petroleum law and legislation--Mexico.
Petroleum--Mexico.
Harvard subject headings:
Constitutional law--Mexico--Cases.
Petroleum industry and trade--Mexico
Petroleum law and legislation--Mexico.
Petroleum--Mexico
Princeton subject headings:
Mexico--Constitutional law--Cases.
Petroleum industry and trade--Mexico.
Petroleum law and legislation--Mexico.
Petroleum--Mexico.