Columbia subject headings:
Harvard subject headings:
Agricultural conservation--United States--Case studies.
Agriculture--Environmental aspects--United States--Case studies.
Agrobiodiversity conservation--United States--Case studies.
Agrobiodiversity--United States--Case studies.
Sustainable agriculture--Case studies.
Sustainable agriculture--United States--Case studies.
Princeton subject headings:
Agricultural conservation--United States--Case studies.
Agriculture--Environmental aspects--United States--Case studies.
Agrobiodiversity conservation--United States--Case studies.
Agrobiodiversity--United States--Case studies.
Case studies.
Sustainable agriculture--United States--Case studies.