Bergersen, F.J Ed. <br/><br/>
Methods for evaluating biological nitrogen fixation 

 - New York  John Wiley  1980 
 - X, 702p 
<br/><br/><label>ISBN: </label>0-471277-59-2 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Nitrogen fixtion-measurement