Biological nitrogen fixation in farming systems of the tropics - A. Ayanaba; P. J. Dart (New York John Wiley and Sons, 1977)
A. Ayanaba & P. J. Dart: Biological nitrogen fixation in farming systems of the tropics. New York. John Wiley and Sons, 1977. 0-471-99499-5--(589.9506AYA)
ENGLISH