Columbia subject headings:
Harvard subject headings:
Unemployed--Education--Germany--History--Sources.
Unskilled labor--Education (Continuing education)--Germany--History--Sources.
Princeton subject headings:
Occupational retraining--Germany--History--Sources.
Occupational training--Germany--History--Sources.
Unskilled labor--Education (Continuing education)--Germany--History.
Vocational education--Germany--History--Sources.