Russell, E.J. <br/><br/>
Imperial bureau of soil science 

 - England  Harpenden  1936 
 -  14p. ; 25 cm 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Science<br/>1936
<br/><br/><label>Universal Decimal Class. No.: </label>11  / X20