Columbia subject headings:
Sustainable agriculture--Research--United States--Congresses.
Sustainable agriculture--Study and teaching--United States--Congresses.
Sustainable agriculture--United States--Congresses.
Harvard subject headings:
Agriculture--Research
Alternative agriculture--Research.
Sustainable agriculture--Research--United States--Congresses.
Sustainable agriculture--Research.
Sustainable agriculture--Study and teaching--United States--Congresses.
Sustainable agriculture--United States--Congresses.
Princeton subject headings:
Sustainable agriculture--Research--United States--Congresses.
Sustainable agriculture--Study and teaching--United States--Congresses.
Sustainable agriculture--United States--Congresses.