Columbia subject headings:
Educational equalization--Germany--History--19th century.
Educational equalization--Germany--History--20th century.
Social mobility--Germany--History--19th century.
Social mobility--Germany--History--20th century.
Harvard subject headings:
Occupational mobility--Europe--History.
Occupational mobility--Germany--History.
Social mobility--Europe--History.
Social mobility--Germany--History.
Princeton subject headings:
Educational equalization--Germany--History--19th century.
Educational equalization--Germany--History--20th century.
Social mobility--Germany--History--19th century.
Social mobility--Germany--History--20th century.