Columbia subject headings:
Mexico--Economic conditions--1982-1994--Congresses.
Mexico--Politics and government--1988-2000--Congresses.
Mexico--Social conditions--1970---Congresses.
Harvard subject headings:
Mexico--Economic conditions--1982---Congresses.
Mexico--Economic conditions--1994-
Mexico--Politics and government--1988-
Mexico--Politics and government--1988---Congresses.
Mexico--Social conditions--1970---Congresses.
Princeton subject headings:
Mexico--Economic conditions--1994-
Mexico--Politics and government--1988-2000.