Columbia subject headings:
Bombing, Aerial--Germany--History.
Deutsche Reichsbahn (Germany)--History--20th century.
Germany--Economic conditions--1918-1945.
Germany--Strategic aspects.
Railroads and state--Germany--History--20th century.
Transportation--Germany--History--20th century.
Harvard subject headings:
Bombing, Aerial--Germany--History.
Deutsche Reichsbahn (Germany)--History--20th century.
Germany--Economic conditions--1918-1945.
Germany--Politics and government--1918-1933
Germany--Politics and government--1933-1945.
Germany--Strategic aspects.
Railroads and state--Germany--History--20th century.
Transportation--Germany--History--20th century.
Princeton subject headings:
Bombing, Aerial--Germany--History.
Deutsche Reichsbahn (Germany)--History--20th century.
Germany--Economic conditions--1918-1945.
Germany--Strategic aspects.
Railroad and state--Germany--History--20th century.
Transportation--Germany--History--20th century.