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AuthorBancroft, George J. (91)Welles, A. M. (Alonzo Merritt) (55)Marks, John H. (John Henry) (52)Barbre, Thos. J. (51)Peterson, Carl M. (34)Wolf, Albert G. (32)Collins, George E. (29)Murley, J. A., Jr. (24)Schwarz, Theodore E. (24)Stanhope, Philip R. (23)View MoreSubjectUnderground mining -- Colorado (418)Mines and mineral resources -- Colorado -- Clear Creek County (157)Zinc mines and mining -- Colorado (148)Mines and mineral resources -- Colorado -- Gilpin County (106)Mineral processing plants -- Colorado (99)Mines and mineral resources -- Colorado -- Boulder County (96)Mining claims -- Colorado -- Clear Creek County (94)Mines and mineral resources -- Colorado -- San Juan County (89)Mining claims -- Colorado -- Gilpin County (82)Views -- Interior (69)View MoreDate Issued1990 - 1999 (9)1982 - 1989 (8)