Columbia subject headings:
P.S.O.E. (Political party)--History.
Socialism--Spain--History--20th century.
Spain--History--Republic, 1931-1939.
Harvard subject headings:
Nationalism and socialism--Spain--History--20th century.
P.S.O.E. (Political party)--History--20th century.
Socialism--Spain--History--20th century
Spain--Politics and government--1931-1939.
Princeton subject headings:
Nationalism and socialism--Spain--History--20th century.
P.S.O.E. (Political party)--History--20th century.
Socialism--Spain--History--20th century.
Spain--Politics and government--1931-1939.