Gill, William R. <br/><br/>
Soil dynamics in tillage and traction 

 - Washington :  USDA. Agricultural Research Service,  (1967) 
 - 511 p.  : ilus. 
 - USDA. Agriculture handbook  ; 316 .
 - USDA Agriculture handbook  ; 316 .
<br/><br/><label>LCCN: </label>12443 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Labranza--Efecto en suelos<br/>Suelos--Física de.
<br/><br/><label>Dewey Class. No.: </label>631.43  / G5