Collings, Gilbeart H.  1895-1964. <br/><br/>
Commercial fertilizers,  their sources and use. 

 - 4th ed. 
 - Philadelphia  [1947] 
 - xi, 522 p.  illus (part col.) ports. maps.  24 cm 
 - Blakiston books on agriculture .
<br/><br/>Bibliography: p. 475-498. 
<br/><br/><label>LCCN: </label>agr47000312  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Fertilizers.
<br/><br/><label>LC Class. No.: </label>S633  / .C69 1947