Columbia subject headings:
P.S.O.E. (Political party). Comisión Ejecutiva--Archives--Catalogs.
Socialism--Spain--History--20th century--Manuscripts--Catalogs.
Socialism--Spain--History--20th century--Sources--Bibliography--Catalogs.
Spain--History--Civil War, 1936-1939--Manuscripts--Catalogs.
Spain--History--Civil War, 1936-1939--Sources--Bibliography--Catalogs.
Unión General de Trabajadores de España. Comisión Ejecutiva--Archives--Catalogs.
Harvard subject headings:
Princeton subject headings:
P.S.O.E. (Political party). Comisión Ejecutiva--Archives--Catalogs.
Socialism--Spain--History--20th century--Manuscripts--Catalogs.
Socialism--Spain--History--20th century--Sources--Bibliography--Catalogs.
Spain--History--Civil War, 1936-1939--Manuscripts--Catalogs.
Spain--History--Civil War, 1936-1939--Sources--Bibliography--Catalogs.
Unión General de Trabajadores de España. Comisión Ejecutiva--Archives--Catalogs.