Columbia subject headings:
Industries--United States.
Manufacturing industries--United States.
Unemployment--United States.
United States--Economic conditions--2001-
Harvard subject headings:
Industries--United States
Manufacturing industries--United States
Unemployment--United States
United States--Economic conditions--2001-2009.
Princeton subject headings:
Industries--United States.
Manufacturing industries--United States.
Unemployment--United States.
United States--Economic conditions--2001-2009.