Herbert E, Gregory <br/><br/>
Geology of the Navajo Country a reconnaissance of Parts of Arizona, New MÚxico, and Utah. 

 - Washington  Government Printing Office  1917 
 - 161 p. 
<br/><br/> Impreso 
<br/><br/><br/>Ingles 
<br/><br/><label>Subjects--Topical Terms: </label><br/>MINERIA