Elkan Gerald H Ed. <br/><br/>
Symbiotic nitrogen fixation technology. 

 -  1987 
<br/><br/><label>Standard No.: </label>21519 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Dewey Class. No.: </label>E9G,5,5, M7