Columbia subject headings:
Petroleum industry and trade--Government ownership--Social aspects--Mexico.
Petroleum industry and trade--Social aspects--Mexico.
Petroleum law and legislation--Mexico.
Harvard subject headings:
Petroleum industry and trade--Government ownership--Social aspects--Mexico.
Petroleum industry and trade--Social aspects--Mexico.
Petroleum law and legislation--Mexico
Princeton subject headings:
National characteristics, Mexican.
Petroleum industry and trade--Government ownership--Mexico--History.
Petroleum industry and trade--Mexico--Psychological aspects.
Petroleum industry and trade--Social aspects--Mexico.