Stewart, W. D. P. <br/><br/>
Nitrogen fixation by free living organisms 

 - Cambridge  Cambridge University Press  1975 
 - xxi,471p.  23cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Nitrogen
<br/><br/><label>LC Class. No.: </label>QR89.7.N57