Biological nitrogen fixation and sustainability of tropical agriculture :
Biological nitrogen fixation and sustainability of tropical agriculture : proceedings of the Fourth International Conference of the African Association for Biological Nitrogen Fixation (AABNF), held at the International Institute of Tropical Agriculture (IITA), Ibadan, Nigeria, 24-28 September 1990 /
edited by K. Mulongoy, M. Gueye, and D.S.C. Spencer.
- Chichester, West Sussex, U.K. ; New York : J. Wiley, 1992.
- xiv, 488 p. : ill. ; 26 cm.