Biological nitrogen fixation in farming systems of the tropics - Symposium on Biological Nitrogen Fixation in Farming Systems of the Tropics (Oct, 1975: Ibadan, Nigeria); Ayanaba, A.; Dart P.J. (Chichester: John Wiley and sons, 1977)
Includes index
Keywords: Agriculture -- Tropics -- Congresses; Nitrogen fixation -- Congresses