Minerals of Colorado
Edwin Butt Eckel
Comments: ill. (some col.), col. maps ;
"Sponsored by the Friends of Mineralogy, Colorado Chapter, and the Denver Museum of Natural History."
"Udated and revised by Robert R. Cobban, Donley S. Collins, Eugene E. Foord, Dainel E. Kile, Peter J. Modreski, and Jack A. Murphy"
Subjects: Mines and mineral resources, Minerals