Columbia subject headings:
Agriculture, Cooperative--United States--Societies, etc.
Cooperation--United States--Societies, etc.
Cooperative societies--United States--Periodicals.
Harvard subject headings:
Agriculture, Cooperative--United States--Congresses.
Cooperation--Congresses
Cooperation--United States--Congresses.
Cooperative societies--Congresses.
Princeton subject headings:
Agriculture, Cooperative--United States.
Cooperation--Periodicals.
Cooperation--United States.
Cooperative societies--Periodicals.
Periodicals.