Columbia subject headings:
Harvard subject headings:
Employees--Training of--Germany--History--20th century.
Labor market--Germany--History--20th century.
Occupational training--Germany--History--20th century.
Vocational education--Germany--History--20th century.
Princeton subject headings:
Employees--Training of--Germany--History--20th century.
Labor market--Germany--History--20th century.
Occupational training--Germany--History--20th century.
Vocational education--Germany--History--20th century.