Nutman,P.S. <br/><br/>
Symbiotic nitrogen fixation in plants 
by P.S. Nutman 
 - london  cambridge  1976 
 - xxviii,584p. 
<br/><br/><label>ISBN: </label>000 
<br/><br/><label>Dewey Class. No.: </label>581.12  / NUT/S