Barker, Fred

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 ; .

Includes bibliographical references


Geology
Geology, Stratigraphic--Precambrian

557.3