Columbia subject headings:
Canada--Economic policy.
Energy policy--Canada.
Energy policy--Mexico.
Mexico--Economic policy--1970-1994.
Harvard subject headings:
Canada--Economic policy.
Energy policy--Canada
Energy policy--Mexico
Mexico--Economic policy--1970-1994.
Princeton subject headings:
Canada--Economic policy.
Energy policy--Canada.
Energy policy--Mexico.
Mexico--Economic policy--1970-1994.