Columbia subject headings:
Occupational training--United States--History--20th century.
Youth--Employment--United States--History--20th century.
Harvard subject headings:
Occupational training--United States--History--20th century.
Youth--Employment--United States--History--20th century.
Princeton subject headings:
Manpower policy--United States.
Minority youth--Employment--United States.
Youth--Employment--United States.