Cross, Whitman - Larsen, Esper S. <br/><br/>
Contributions to the stratigraphy of southwestern Colorado. 

 - Washington  Government Printing Office  1914 
 - pp. 39-50 
<br/><br/> Impreso 
<br/><br/><br/>Ingles 
<br/><br/><label>Subjects--Topical Terms: </label><br/>MINERIA