Columbia subject headings:
Agriculture--Economic aspects--Africa, Sub-Saharan.
Farms, Small--Africa, Sub-Saharan.
Food supply--Africa, Sub-Saharan.
Subsistence farming--Africa, Sub-Saharan.
Sustainable agriculture--Africa, Sub-Saharan.
Harvard subject headings:
Agriculture and state--Africa, Sub-Saharan.
Agriculture--Economic aspects--Africa, Sub-Saharan
Food supply--Africa, Sub-Saharan
Subsistence economy.
Princeton subject headings: