Columbia subject headings:
Agriculture--Economic aspects--United States--Bibliography.
Farms, Small--United States--Bibliography.
Farms--United States--Bibliography.
Harvard subject headings:
Agriculture--Economic aspects--United States--Bibliography of bibliographies.
Agriculture--Economic aspects--United States--Bibliography.
Farms, Small--United States--Bibliography.
Farms--United States--Bibliography.
Princeton subject headings:
Agriculture--Economic aspects--United States--Bibliography.
Farms, Small--United States--Bibliography.
Farms--United States--Bibliography.