Columbia subject headings:
Mexico--Politics and government--1946-1970--Periodicals.
Partido Revolucionario Institucional--Periodicals.
Harvard subject headings:
Mexico--Politics and government--1970-1988.--Periodicals.
Mexico--Politics and government--1988-
Partido Revolucionario Institucional--Periodicals.
Princeton subject headings:
Mexico--Politics and government--1946---Periodicals.
Partido Revolucionario Institucional--Periodicals.