Columbia subject headings:
Harvard subject headings:
Möhne River Dam (Germany)--Pictorial works.
Möhne River Valley (Germany)--History--Bombardment, 1943--Pictorial works.
Princeton subject headings:
Dams--Germany (West)--Ruhr River Valley--History.
Möhne River--Floods.
Ruhr River Valley (Germany)--History.
World War, 1939-1945--Germany--Aerial operations, British.