Biological nitrogen fixation in farming systems of the Tropics / 
edited by A. Ayanaba and P. J. Dart 
 - Chichester :  Wiley,  1977 
 - xi, 377 p. :  ill. ;  24 cm. 
<br/><br/> 'Based on papers presented at a symposium held at the International Institute of Tropical Agriculture, Ibadan, Nigeria, in October 1975.' 
<br/><br/>Includes bibliographies and index 
<br/><br/><label>ISBN: </label>0471994995 
<br/><br/><label>LCCN: </label>77-1304 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Nitrogen--Fixation--Congresses<br/>Agriculture--Tropics--Congresses<br/>Cropping systems--Tropics--Congresses