Columbia subject headings:
Europe--Social conditions.
Germany--Economic conditions.
Germany--Politics and government--20th century.
Germany--Social conditions.
Industries--Germany--History.
Harvard subject headings:
Europe--Social conditions.
Germany--Economic conditions.
Germany--Politics and government--20th century
Germany--Social conditions.
Industries--Germany--History
Princeton subject headings:
Europe--Social conditions.
Germany--Economic conditions.
Germany--Politics and government--20th century.
Germany--Social conditions.
Industries--Germany--History.