Columbia subject headings:
Economic assistance, Domestic--United States.
Labor supply--United States.
Public welfare--United States.
Unemployed--United States.
Harvard subject headings:
Economic assistance, Domestic--United States.
Labor supply--United States.
Public welfare--United States
Unemployed--United States
Princeton subject headings:
Economic assistance, Domestic--United States.
Labor supply--United States.
Public welfare--United States.
Unemployed--United States.