http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Argentian cryptomelane and bromargyrite in volcanic rocks near Silver Cliff, Colorado
1 online resource (iii, 23 pages) : illustrations.
by Fred A. Hildebrand and Elwin L. Mosier.
Title from title screen (viewed August 4, 2014).
"This report describes silver minerals, especially a new variety of cryptomelane, and explains why unmined silver ores remain at the surface in this old mining district."
Includes bibliographical references (page 23).