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[Farming systems research in Botswana] / G. Heinrich and E. Modiakgotla.
- [FAO/SIDA] Farming systems programme,
- 1992.
- Gaborone, Botswana :
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Performance of the common extension package for cereal grain production and its components, in Tutume district, 1983-85 / G.M. Heinrich and S. Masikara.
- Ministry of agriculture. Dept. of agricultural research. Agricultural technology improvement project,
- 1985.
- Gaborone, Botswana :
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Testing an accelerated extension approach in North East district : the case of extension-oriented farmer testing groups / by G. Heinrich...[et al.].
- Ministry of agriculture. Dept. of agricultural research. Agricultural technology improvement project,
- 1990.
- Gaborone, Botswana :