Columbia subject headings:
Mexico--Description and travel.
Mexico--Foreign relations.
Mexico--Politics and government--1910-1946.
Mexico--Social conditions.
Harvard subject headings:
Mexico--Description and travel.
Mexico--Foreign relations.
Mexico--Politics and government--1910-1946.
Mexico--Social conditions.
Princeton subject headings:
Mexico--Description and travel.
Mexico--Foreign relations.
Mexico--Politics and government--1910-1946.
Mexico--Social conditions.