Methods for evaluating biological nitrogen fixation / 
edited by F. J. Bergersen. 
 - Chichester :  J. Wiley,  1980. 
 - x, 702 p. :  ill. ;  24 cm. 
<br/><br/>Includes indexes and bibliography. 
<br/><br/> Closed. 
<br/><br/><label>ISBN: </label>0471277592 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Nitrogen--Fixation.<br/>Nitrogen-fixing microorganisms.