Columbia subject headings:
Harvard subject headings:
Agriculture--Economic aspects--United States--Statistics--Charts, diagrams, etc.--Periodicals.
Agriculture--United States--Charts, diagrams, etc.--Periodicals.
Agriculture--United States--Statistics--Periodicals.
Princeton subject headings:
Agriculture--Economic aspects--United States--Statistics--Charts, diagrams, etc.--Periodicals.
Agriculture--United States--Charts, diagrams, etc.--Periodicals.
Agriculture--United States--Statistics--Periodicals.
Periodicals.
Statistics.