Nitrogen fixation / 
edited by William E. Newton and William H. Orme-Johnson. 
 - Baltimore :  University Park Press,  1980. 
 - v. :  ill. ;  24cm. 
<br/><br/> Includes index. 
<br/><br/>Contents: v.1. Free-living systems and chemical models - v.2. Symbiotic associations and cyanobacteria. 
<br/><br/><label>ISBN: </label>0839115601 (v. 1) 083911561X (v. 2) 
<br/><br/><label>Subjects--Topical Terms: </label><br/> Micro--organisms, Nitrogen--fixing--Congresses.<br/> Nitrogen--Fixation--Congresses.<br/> Nitrogen fixation--Congresses.