Collings, Gilbeart H.  <br/><br/>
Commercial fertilizers :   their sources and use / 
Gilbeart H. Collings. 
 - 5th ed. 
 - New York :  Mcgraw-Hill book co.,  c 1962. 
 - 617 p. :  ill. ;  23 cm. 
<br/><br/>338  338 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Fertilizers.
<br/><br/><label>Dewey Class. No.: </label>631.8 / C629c