BELL 1907 EIGHTH ANN REPT MINING IND IDAHO FOR 1906 P 149BELL 1908 NINTH ANN REPT MINING IND IDAHO FOR 1907 P 194BELL 1909 TENTH ANN REPT MINING IND IDAHO FOR 1908 P 125BELL 1912 THIRTEENTH ANN REPT MINING IND IDAHO FOR 1911 P 1BELL 1913 FOURTEENTH ANN REPT MINING IND IDAHO FOR 1912 P 1UMPLEBY AND JONES 1923 USGS BULL 732 P 105HOSTERMAN, 1956, USGS B-1027-P.