Columbia subject headings:
Cuba--History--1909-1933--Sources.
Cuba--History--1933-1959--Sources.
Labor--Cuba.
Machado y Morales, Gerardo, 1871-1939.
Harvard subject headings:
Communism--Cuba--History--Sources.
Cuba--History--1909-1933--Sources.
Cuba--History--1933-1959--Sources.
Cuba--Politics and government--1909-1933--Sources.
Labor and laboring classes--Cuba.
Labor unions--Cuba--Political activity--History--Sources.
Machado y Morales, Gerardo, 1871-1939.
Princeton subject headings:
Cuba--History--1909-1933--Sources.
Cuba--History--1933-1959--Sources.
Machado y Morales, Gerardo, 1871-1939.
Working class--Cuba.