Columbia subject headings:
Agricultural administration--United States.
Agriculture--Economic aspects.
Farm produce--Taxation.
Internal revenue law--United States.
Taxation--United States.
Harvard subject headings:
Agricultural administration--United States.
Agriculture--Economic aspects
Agriculture--Economic aspects--United States
Farm produce--Taxation
Farm produce--Taxation--United States.
Internal revenue law--United States.
Taxation--Law and legislation--United States
Princeton subject headings: