Columbia subject headings:
Agriculture--Africa, Sub-Saharan.
Agriculture--Research--Africa, Sub-Saharan.
Biotechnology--Africa, Sub-Saharan.
Biotechnology--Research--Africa, Sub-Saharan.
Soil management--Africa, Sub-Saharan.
Soil management--Research--Africa, Sub-Saharan.
Water resources development--Africa, Sub-Saharan.
Water resources development--Research--Africa, Sub-Saharan.
Harvard subject headings:
Biotechnology--Africa.
Natural resources--Africa--Management.
Soil management--Africa.
Water conservation--Africa.
Watershed management--Africa.
Princeton subject headings: