Columbia subject headings:
Harvard subject headings:
Germans--Spain--History--20th century.
Saarland (Germany)--History--20th century.
Spain--History--Civil War, 1936-1939--Participants, German.
Volunteers--Germany--Saarland--History--20th century.
Princeton subject headings:
Germans--Spain--History--20th century.
Saarland (Germany)--History--20th century.
Spain--History--Civil War, 1936-1939--Participants, German.
Volunteers--Germany--Saarland--History--20th century.