Columbia subject headings:
Largo Caballero, Francisco, 1869-1946.
Socialism--Spain--History--20th century.
Spain--Politics and government--1886-1931.
Spain--Politics and government--1931-1939.
Harvard subject headings:
Largo Caballero, Francisco, 1869-1946.
Socialism--Spain--20th century.
Socialism--Spain--History--20th century
Spain--Politics and government--1886-1931.
Spain--Politics and government--1931-1939.
Princeton subject headings:
Spain--Politics and government--1931-1939.