na INLIS000000000001336 20180523110423 0010-0317001334 180523 0 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 New York : John Wiley Sons, 1992 xiv, 488 hlm. ; 24 cm 0471935603 589.901 33 Int b 589.901 33 nitrogenpertanian 300162995 300163095 162895412 300163095 300162995 162895412 300162995 300163095 162895412