PO-01 Poster Symbols of Colorado: Mineral PO-01 Poster – Symbols of Colorado: Mineral, Gem, Rock and Fossil
IS-68 Directory of Active Mines and Mine Permits in Colorado IS-68 Directory of Active Mines and Mine Permits in Colorado, 2002
IS-45 Active Permitted Mine Operations in Colorado IS-45 Active Permitted Mine Operations in Colorado, 1996-1997
IS-41 Active Permitted Mine Operations in Colorado IS-41 Active Permitted Mine Operations in Colorado, 1995-96