Columbia subject headings:
Harvard subject headings:
Agricultural assistance--Congresses.
Agricultural assistance--Social aspects--Congresses.
Agriculture--International cooperation--Congresses.
Agriculture--International cooperation--Social aspects--Congresses.
Princeton subject headings:
Agricultural assistance--Congresses.
Agricultural assistance--Social aspects--Congresses.
Agriculture--International cooperation--Congresses.
Agriculture--International cooperation--Social aspects--Congresses.