Columbia subject headings:
Disappeared persons--Spain.
Spain--History--Civil War, 1936-1939.
Harvard subject headings:
Disappeared persons--Spain--History--20th century.
Spain--History--Civil War, 1936-1939--Atrocities.
Princeton subject headings:
Disappeared persons--Spain--History--20th century.
Spain--History--Civil War, 1939-1939--Atrocities.