Columbia subject headings:
Harvard subject headings:
Mexico--History--1946-1970.
Mexico--Politics and government--1946-1970
Mexico--Social conditions--20th century.
Social conflict--Mexico--History--20th century.
Princeton subject headings:
Mexico--History--1946-1970.
Mexico--Politics and government--1946-1970.
Mexico--Social conditions--20th century.
Social conflict--Mexico--History--20th century.