Barker, Fred <br/><br/>
Gold investigations in precambrian classic and pelitic rocks Southwestern Colorado and Northern New Mexico / 
by Fred Barker 
 - Washington, D.C. :  United States Geological Survey,  1969 
 - iii,22 p. :  ill., maps ;  25 cm. 
 - Contributions to economic geology Geological Survey Bulletin ; .
<br/><br/>Includes bibliographical references 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geology<br/>Geology, Stratigraphic--Precambrian
<br/><br/><label>Dewey Class. No.: </label>557.3