Columbia subject headings:
Harvard subject headings:
Air defenses--Germany--Frankfurt am Main--History--20th century--Exhibitions.
Frankfurt am Main (Germany)--History--20th century--Exhibitions.
World War, 1939-1945--Destruction and pillage--Germany--Frankfurt am Main--Exhibitions.
World War, 1939-1945--Germany--Frankfurt am Main--Aerial operations, American--Exhibitions.
World War, 1939-1945--Germany--Frankfurt am Main--Aerial operations, British--Exhibitions.
World War, 1939-1945--Germany--Frankfurt am Main--Aerial operations--Exhibitions.
Princeton subject headings:
Air defenses--Germany--Frankfurt am Main--History--20th century--Exhibitions.
Frankfurt am Main (Germany)--History--20th century--Exhibitions.
World War, 1939-1945--Destruction and pillage--Germany--Frankfurt am Main--Exhibitions.
World War, 1939-1945--Germany--Frankfurt am Main--Aerial operations, American--Exhibitions.
World War, 1939-1945--Germany--Frankfurt am Main--Aerial operations, British--Exhibitions.
World War, 1939-1945--Germany--Frankfurt am Main--Aerial operations--Exhibitions.