Columbia subject headings:
Harvard subject headings:
Germany. Luftwaffe.
Plymouth (England)--History--Bombardment, 1941.
World War, 1939-1945--Aerial operations, German.
World War, 1939-1945--Great Britain.
Princeton subject headings:
Germany. Luftwaffe
Plymouth (England)--History.
World War, 1939-1945--Aerial operations, German.
World War, 1939-1945--England--Plymouth.