Columbia subject headings:
Harvard subject headings:
Labor contract.
Labor costs.
Labor market--History.
Labor supply--Effect of education on--History.
Manpower policy--History.
Occupational training
Unemployment
Princeton subject headings:
Labor contract.
Labor costs.
Labor market--History.
Labor supply--Effect of education on--History.
Manpower policy--History.
Occupational training.
Unemployment.