Columbia subject headings:
Guernica (Spain)--History--Bombardment, 1937.
Spain--History--Civil War, 1936-1939--Aerial operations, German.
Harvard subject headings:
Guernica (Spain)--History--Bombardment, 1937.
Spain--History--Civil War, 1936-1939--Aerial operations, German.
Princeton subject headings:
Guernica (Spain)--History--Bombardment, 1937.
Spain--History--Civil War, 1936-1939--Aerial operations.