Columbia subject headings:
Labor market--United States.
Manpower policy--United States.
Seasonal unemployment--United States.
Unemployment--United States.
Harvard subject headings:
Labor market--United States.
Manpower policy--United States
Seasonal unemployment--United States.
Unemployment--United States
Princeton subject headings:
Labor market--United States.
Manpower policy--United States.
Seasonal unemployment--United States.
Unemployment--United States.