BALDWIN G P BLACK HILLS ILLUSTRATED BLACK HILLS MINING MENS1904 PP 23 AND 143CONNOLLY J P AND OHARRA C C THE MINERAL WEALTH OF THE BLACKD SCHOOL OF MINES BULL 16 1929 P 200.IRVING J D ET AL ECONOMIC RESOURCES OF THE NORTHERN BLACK HIG S PROF PAPER 26 1902 PP 207 209LINCOLN F C ET AL THE MINING INDUSTRY OF SOUTH DAKOTA S D SCMINES BULL 17 1937 P 106PYLE K D THE HOMESTAKE TUNGSTEN MILL BLACK HILLS ENGINEER VO3 MAY 1926 P 171SOUTH DAKOTA MINE.INSPECTOR ANN REPORTS FOR 1899 TO 1905 19119 AND 1926 TO 1929S DAK STATE PLANNING BOARD TUNGSTEN MINING IN S DAK 1936 PPO 16U S BU MINES STAFF REGION V BLACK HILLS MINERAL ATLAS S DAKMINES INF CIRC 7688 1954 PP 80 TO 81