Columbia subject headings:
Nationalism--Spain--País Vasco--History--20th century.
País Vasco (Spain)--Politics and government--20th century.
Spain--History--Civil War, 1936-1939.
Harvard subject headings:
Nationalism--Spain--País Vasco--History--20th century
País Vasco (Spain)--History--20th century.
Princeton subject headings:
Nationalism--Spain--País Vasco--History--20th century.
País Vasco (Spain)--History--20th century.