Columbia subject headings:
Harvard subject headings:
Germany. Luftwaffe--History.
Guernica (Spain)--History--Bombardment, 1937.
Spain--History--Civil War, 1936-1939.
World War, 1939-1945--Poland--Aerial operations.
Wunstorf (Germany)--History--20th century.
Princeton subject headings:
Guernica (Spain)--History--Bombardment, 1937.
Spain--History--Civil War, 1936-1939.
World War, 1939-1945--Poland--Aerial operations.
Wunstorf (Germany)--History--20th century.