Columbia subject headings:
Communist International--Mexico--History--Sources.
Cárdenas, Lázaro, 1895-1970.
Mexico--History--20th century.
Partido Comunista Mexicano--Sources.
Work and workers--Mexico--Social movements.
Harvard subject headings:
Communist International--History--Sources.
Cárdenas, Lázaro, 1895-1970.
Labor movement--Mexico.
Mexico--History--20th century.
Partido Comunista Mexicano--Sources.
Princeton subject headings:
Cárdenas, Lázaro, 1895-1970.
Communism--Mexico--History--20th century--Sources.
Communist International--History--20th century--Sources.
Mexico--Politics and government--1910-1946--Sources.
Partido Comunista Mexicano--History--20th century--Sources.