Columbia subject headings:
Spain--History--Civil War, 1936-1939--Participation, Foreign.
Spain--History--Civil War, 1936-1939--Pictorial works.
Harvard subject headings:
Spain--History--Civil War, 1936-1939--Participation, Foreign.
Spain--History--Civil War, 1936-1939--Pictorial works.
Princeton subject headings:
Spain--History--Civil War, 1936-1939--Participation, Foreign.
Spain--History--Civil War, 1936-1939--Pictorial works.