Reference | {Deposit:: BUSH, A.L., AND OTHERS, 1961, PRELIMINARY GEOLOGIC MAP OF THE GRAY HEAD QUADRANGLE, SAN MIGUEL COUNTY, COLORADO: USGS MAP MF-176.}{Deposit:: HESS, F.L., 1913, NOTES ON THE VANADIUM DEPOSITS NEAR PLACERVILLE, COLORADO: USGS BULL. 530, P. 142-156.}{Deposit:: BUSH, A.L., AND OTHERS, 1959, AREAL GEOLOGY OF THE PLACERVILLE QUADRANGLE, SAN MIGUEL COUNTY, COLORADO: USGS BULL. 1072-E, P. 376-377.} |