Columbia subject headings:
Constitutional history--Mexico--20th century.
Mexico--Politics and government--1910-1946.
Mexico. Constitución política (1917)
Harvard subject headings:
Constitutional history--Mexico--20th century.
Mexico--Politics and government--1910-1946.
Mexico. Constitución política (1917)
Princeton subject headings:
Constitutional history--Mexico--20th century.
Mexico--Politics and government--1910-1946.
Mexico. Constitución política (1917)