Columbia subject headings:
Harvard subject headings:
Labor market--Germany--History--19th century.
Labor market--Germany--History--20th century.
Occupations--Germany--History--19th century.
Occupations--Germany--History--20th century.
Unemployment--Germany--History--19th century.
Unemployment--Germany--History--20th century.
Princeton subject headings:
Labor market--Germany--History--19th century.
Labor market--Germany--History--20th century.
Occupations--Germany--History--19th century.
Occupations--Germany--History--20th century.
Unemployment--Germany--History--19th century.
Unemployment--Germany--History--20th century.