Youngs, F. O. <br/><br/>
Soil survey of the Yuma-Wellton area, Arizona California 

 - Washington :  Bureau of Chemistry and Soils,  (1929) 
 - 37 p.  : ilus. ; mapa 
<br/><br/><label>LCCN: </label>55523 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Suelos--Arizona.<br/>Suelos--California.