TY  - GEN
AU  - Ayanaba,  A
TI  - Biological NItrogen fixation in farming systems of the tropics
SN  - 0-471-994995
U1  - 631.580913 AYA 
CY  - Chichestor, John Wiley & Sons
KW  - Nitrogen fixation / agriculture- tropics- congresses / Nitrogen fixation congresses
ER  -