Poulson, E. N. <br/><br/>
Soil survey of the upper Gila Valley area, Arizona 

 - (Washington) :  Bureau of Chemistry and Soils,  1938 
 - 41 p.  : ilus. ; mapa 
<br/><br/><label>LCCN: </label>54031 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Suelos--Arizona.