U.S. Department of agriculture <br/><br/>
Soil survey manual 

 - Calcutta  Oxford and I.B.H.  1966 
 - vii, 503p.; 23cm.- 
 - U.S. Department Agriculture .
<br/><br/> handbook, no. 18. 
<br/><br/><label>Dewey Class. No.: </label>581.5  / U.S.