STEWARD,W.D.D Ed. <br/><br/>
Nitrogen Fixation by free-living Micro-organisms 

 - London.  Cambridge Uni. Press, GB  1975 
 - (xxi),471p 
<br/><br/><label>ISBN: </label>521207088 
<br/><br/><label>Dewey Class. No.: </label>589