Columbia subject headings:
Harvard subject headings:
Germany--Economic conditions--1918-1945.
Germany--History--Bombardment, 1940-1945.
Industries--Germany--History--20th century
World War, 1939-1945--Aerial operations
Princeton subject headings:
Germany--Economic conditions--1918-1945.
Germany--History--Bombardment, 1942-1945.
Industries--Germany--History--20th century.
World War, 1939-1945--Aerial operations.