Columbia subject headings:
Forced labor--Spain--History--20th century.
Francoism.
Political prisoners--Spain--History--20th century.
Spain--History--1939-1975.
Harvard subject headings:
Concentration camps--Spain--History--20th century.
Forced labor--Spain--History--20th century.
Political persecution--Spain--History--20th century.
Political prisoners--Spain--History--20th century.
Prisons--Spain--History--20th century.
Spain--History--Civil War, 1936-1939--Conscript labor.
Princeton subject headings: