Columbia subject headings:
Harvard subject headings:
Berlin (Germany)--Economic conditions
Berlin (Germany)--History--1918-1945
Berlin (Germany)--Population--History--20th century.
Germany--Politics and government--1918-1933
Working class--Germany--Berlin--History--20th century.
Princeton subject headings:
Berlin (Germany)--Economic conditions--History--20th century.
Berlin (Germany)--Population--History--20th century.
Industries--Germany--Berlin--History--20th century.