Columbia subject headings:
Mexico--History--1910-1946.
Obregón, Álvaro, 1880-1928--Pictorial works.
Presidents--Mexico--Pictorial works.
Harvard subject headings:
Generals--Mexico--Biography
Mexico--Politics and government--1910-1946.
Obregón, Álvaro, 1880-1928
Presidents--Mexico--Biography
Princeton subject headings:
Generals--Mexico--Biography.
Mexico--Politics and government--1910-1946.
Obregón, Álvaro, 1880-1928.
Presidents--Mexico--Biography.