Columbia subject headings:
Mexico--History--Revolution, 1910-1920.
Obregón, Álvaro, 1880-1928.
Harvard subject headings:
Mexico--History--Revolution, 1910-1920.
Obregón, Álvaro, 1880-1928
Princeton subject headings:
Mexico--History--Revolution, 1910-1920.
Obregón, Álvaro, 1880-1928.