Columbia subject headings:
Mineral industries--Mexico.
Mines and mineral resources--Mexico.
Mining engineering--Mexico.
Petroleum law and legislation--Mexico.
Petroleum--Mexico.
Harvard subject headings:
Great Britain--Foreign relations--Mexico.
Great Britain--Foreign relations--United States
Mexico--Foreign relations--Great Britain.
Mexico--Foreign relations--United States
Mining law--Mexico.
United States--Foreign relations--Great Britain
United States--Foreign relations--Mexico
Princeton subject headings: