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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.] :
-
Soil conservation and management in the humid tropics / ed. by D.J. Greenland and R. Lal.
- Wiley,
- 1977.
- Chichester [etc.] :