Biological nitrogen fixation in farming systems of the tropics/ 
edited by A. Ayanaba and P.J. Dart 
 - Chichester:  John Wiley and sons,  c1977 
 - xi, 377 p.:  ill.;  23 cm. 
<br/><br/> Includes index 
<br/><br/><label>ISBN: </label>0471994995  $ 36.50 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Agriculture--Congresses--Tropics<br/>Nitrogen fixation--Congresses
<br/><br/><label>Dewey Class. No.: </label>630.913