Columbia subject headings:
Cologne (Germany)--History--Pictorial works.
World War, 1939-1945--Destruction and pillage--Germany--Cologne.
World War, 1939-1945--Germany--Cologne--Pictorial works.
Harvard subject headings:
Cologne (Germany)--Pictorial works.
World War, 1939-1945--Destruction and pillage--Germany--Cologne.
Princeton subject headings: