Columbia subject headings:
Latin America--Congresses.
Mexico--Congresses.
World politics--1989---Congresses.
Harvard subject headings:
Latin America--Congresses.
Mexico--Congresses.
World politics--1989---Congresses
Princeton subject headings:
America--Politics and government--20th century--Congresses.
Latin America--Politics and government--20th century--Congresses.
Mexico--Economic conditions--20th century--Congresses.
Mexico--Politics and government--20th century--Congresses.
South America--Politics and government--20th century--Congresses.
World politics--20th century--Congresses.