| Reference | {Deposit:: NELSON-MOORE, J. L., COLLINS, D. B., AND HORNBAKER, A. L., 1978, RADIOACTIVE MINERAL OCCURRENCES OF COLORADO AND BIBLIOGRAPHY: CGS BULL. 40, P. 272}{Deposit:: TWETO, OGDEN, 1976, GEOLOGIC MAP OF THE CRAIG 1 DEGREE X 2 DEGREES QUADRANGLE, NORTHWESTERN COLORADO: USGS MAP I-972, 1: 250,000} |