Columbia subject headings:
Harvard subject headings:
Mexico--Economic conditions.
Mexico--History--1867-1910.
Mexico--History--Revolution, 1910-1920--Causes.
Mexico--Social conditions.
Zapata, Emiliano, 1879-1919
Princeton subject headings:
Mexico--Economic conditions.
Mexico--History--1867-1910.
Mexico--History--Revolution, 1910-1920--Causes.
Mexico--Social conditions.
Zapata, Emiliano, 1879-1919.