Biological nitrogen fixation in farming system of the tropics/ 
editied by A.Ayanaba and P.J.Dart 
 - Toronto   John Wiley and sons   1997 
 - vii,377.:  ill.;Hbk 
<br/><br/><label>ISBN: </label>0471994995 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Agriculture --Congresses--Tropics <br/>Nitrogen --Congresses --Fixation 
<br/><br/><label>LC Class. No.: </label>S481.B56  / 1977