RS-29 Directory and Statistics of Colorado Coal Mines with Distribution and Electric Generation Map RS-29 Directory and Statistics of Colorado Coal Mines with Distribution and Electric Generation Map, 1989
IS-26 Reconnaissance Study of Coal Fires in Inactive Colorado Coal Mines IS-26 Reconnaissance Study of Coal Fires in Inactive Colorado Coal Mines
B-30 Geology and Ore Deposits of the Red Cliff District B-30 Geology and Ore Deposits of the Red Cliff District, Colorado
B-02 Geology of the Grayback Mining District B-02 Geology of the Grayback Mining District, Costilla County, Colorado
GEO-1886-01 Geology and mining Industry of Leadville GEO-1886-01 Geology and Mining Industry of Leadville, Colorado with Atlas