Columbia subject headings:
Poor--United States.
Underemployment--United States.
Unemployment--United States.
United States--Economic conditions--1981-2001.
Harvard subject headings:
Poor--United States
Underemployment--United States.
Unemployment--United States
United States--Economic conditions--1981-2001.
Princeton subject headings:
Poor--United States.
Underemployment--United States.
Unemployment--United States.
United States--Economic conditions--1981-2001.