Columbia subject headings:
Energy industries--United States--Congresses.
Mexico--Economic conditions--1970-1982--Congresses.
Mexico--Foreign relations--United States--Congresses.
Petroleum industry and trade--Mexico--Congresses.
United States--Foreign relations--Mexico--Congresses.
Harvard subject headings:
Energy industries--United States--Congresses.
Mexico--Economic conditions--1970-1982--Congresses.
Mexico--Foreign relations--United States--Congresses.
Petroleum industry and trade--Mexico--Congresses.
United States--Foreign relations--Mexico--Congresses.
Princeton subject headings:
Energy industries--United States--Congresses.
Mexico--Economic conditions--1970-1982--Congresses.
Mexico--Foreign relations--United States--Congresses.
Petroleum industry and trade--Mexico--Congresses.
United States--Foreign relations--Mexico--Congresses.