Columbia subject headings:
Agricultural laborers--Mexico--History--1946-1970.
Ejidos--Mexico--History--1946-1970.
Peasants--Mexico--History--1946-1970.
Harvard subject headings:
Agricultural laborers--Mexico--History.
Ejidos--Mexico--History.
Peasants--Mexico--History.
Princeton subject headings:
Agricultural laborers--Mexico--History.
Ejidos--Mexico--History.
Peasants--Mexico--History.