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Geology and mineral deposits of the Needle Mountains district, southwestern Colorado
1 online resource (vi, 40 pages, 1 page of plates) : illustrations, maps (some color).
Title from title screen (viewed August 1, 2014).
"A detailed study of the mineral potential of complex instrusive rocks and associated alteration of the Needle Mountains district, Colorado."
Also available online in PDF format from the U.S. Geological Survey Warehouse (http://pubs.er.usgs.gov/).
Includes bibliographical references (pages 39-40).