Columbia subject headings:
Harvard subject headings:
Agriculture and state--Africa--Congresses
Droughts--Africa--Congresses.
Famines--Africa--Congresses.
Food supply--Africa--Congresses
Princeton subject headings:
Agriculture and state--Africa--Congresses.
Droughts--Africa--Congresses.
Famines--Africa--Congresses.
Food supply--Africa--Congresses.