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Soil conservation and management in the humid tropics / ed. by D.J. Greenland and R. Lal.
- Wiley,
- 1977.
- Chichester [etc.] :
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Biological nitrogen fixation in farming systems of the tropics / ed. by A. Ayanaba and P.J. Dart.
- Wiley,
- 1977.
- Chichester [etc.] :
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African survey / Alan C.G. Best, Harm J. De Blij.
- 86
- Wiley,
- 1977.
- New York [etc.] :