Reference | {Deposit:: HEDLUND, D.C., AND OLSON, J.C., 1973, GEOLOGIC MAP OF THE CARPENTER RIDGE QUADRANGLE, GUNNISON COUNTY, COLORADO: USGS MAP GQ-1070.}{Deposit:: HEDLUND, D.C., AND OLSON, J.C., 1961, FOUR ENVIRONMENTS OF THORIUM-, NIOBIUM-, AND RARE-EARTH-BEARING MINERALS IN THE POWDERHORN DISTRICT OOF SOUTHWESTERN COLORADO: USGS PROF. PAPER 424-B, P. B283-B286.} |