Collings, Gilbeart Hooper. <br/><br/>
Commercial fertilizers  : their sources and use 

 - 4 ed. 
 - Philadelphia :  Blakiston,  1947 
 - 522 p.  : ilus. 
<br/><br/><label>LCCN: </label>22341 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Suelos.<br/>Suelos--Fertilidad.
<br/><br/><label>Dewey Class. No.: </label>631.8  / C65 1947