Hopkins Donald Percy  1909 <br/><br/>
Chemicals, humus, and the soil; .  a simple presentation of contemporary knowledge and opinions about fertilizers, manures, and soil fertility 

 - London:  faber and faber lımıted, 
 - viii, 278p.  illus.   21 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Fertilizers<br/>Manures
<br/><br/><label>LC Class. No.: </label>S633