Columbia subject headings:
Contracting out--United States.
Tax administration and procedure--United States.
Tax collection--United States.
United States. Internal Revenue Service--Management.
Harvard subject headings:
Contracting out--United States.
Tax administration and procedure--United States.
Tax collection--United States.
United States. Internal Revenue Service--Management.
Princeton subject headings:
Contracting out--United States.
Tax administration and procedure--United States.
Tax collection--United States.
United States. Internal Revenue Service--Management.