Collings, Gilbert H. <br/><br/>
Commercial fertilizers : 

 - 3rd ed. 
 - Philadelphia :  The Blakiston,  1941. 
 - xx, 478 p. :  col. ill. ;  23 cm. 
<br/><br/> Includes index. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Fertilizer industry<br/>Soil fertility<br/>Agricultural chemistry
<br/><br/><label>Dewey Class. No.: </label>631.8 COL