Columbia subject headings:
Middle class men--Germany--History.
Middle class women--Germany--History.
Single men--Germany--Social conditions.
Single men--History--19th century.
Single men--History--20th century.
Single women--Germany--Social conditions.
Single women--History--19th century.
Single women--History--20th century.
Harvard subject headings:
Princeton subject headings:
Middle class men--Germany--History.
Middle class women--Germany--History.
Single men--Germany--Social conditions.
Single men--History--19th century.
Single men--History--20th century.
Single women--Germany--Social conditions.
Single women--History--19th century.
Single women--History--20th century.