Reference | {Deposit:: PARKER, RAYMOND L., 1963, NIOBIUM AND TANTALUM IN THE UNITED STATES, USGS MINERAL INVESTIGATIONS RESOURCE MAP MR-36.}{Deposit:: SCOTT, G.R., TAYLOR, R.B., EPIS, R.C., WOBUS, R.A., 1978, GEOLOGIC MAP OF THE PUEBLO 10 X 20 QUADRANGLE, SOUTH-CENTRAL COLORADO: USGS MAP I-1022, 1:250,000} |