Columbia subject headings:
Harvard subject headings:
Elections--Mexico--History--20th century.
Mexico--Economic conditions--1970-1982.
Mexico--Politics and government--1970-1988.
Political participation--Mexico--History--20th century.
Political parties--Mexico--History--20th century
Princeton subject headings:
Mexico--Economic conditions--1970-1982.
Mexico--Economic conditions--1982-1994.
Mexico--Politics and government--1970-.