Collings, Gilbert H. <br/><br/>
Commercial fertilizers   their sources and use 
<label>/ by </label> Collings, Gilbert H. 
 - 5th ed. 
 - New York  Mcgraw-Hill Book CO.  1955 
 - xi, 617p.  ill.  23 cm. 
<br/><br/><label>Dewey Class. No.: </label>631.8  / COL