Columbia subject headings:
Harvard subject headings:
Germany--History--20th century--Sources.
Germany--Social conditions--1918-1933.
Germany--Social conditions--1933-1945.
Social classes--Germany--History--20th century--Sources.
Princeton subject headings:
Germany--Economic conditions--1918-1945--Sources.
Germany--Social conditions--1918-1933--Sources.
Germany--Social conditions--1933-1945--Sources.