Columbia subject headings:
Mexico--History--1910-1946.
Mexico--History--1946-1970.
Mexico--History--1970-1988.
Harvard subject headings:
Mexico--History--1910-1946.
Mexico--History--1946-1970.
Mexico--History--1970-1988
Princeton subject headings:
Mexico--History--1910-1946.
Mexico--History--1946-1970.
Mexico--History--1970-1988.