Columbia subject headings:
Agriculture--Technology transfer--Africa, Sub-Saharan.
Organic farming--Africa, Sub-Saharan.
Sustainable agriculture--Africa, Sub-Saharan.
Harvard subject headings:
Agricultural innovations--Africa, Sub-Saharan.
Agriculture--Technology transfer--Africa, Sub-Saharan.
Organic farming--Africa, Sub-Saharan.
Sustainable agriculture--Africa, Sub-Saharan.
Traditional farming--Africa, Sub-Saharan.
Princeton subject headings: