Peterson, Carl M.2019-11-082022-02-032019-11-082022-02-03https://hdl.handle.net/11124/173384Donor: Colorado Mining Association.Photographed by Carl M. Peterson.Three men on a stage in a double-jack drilling competition, Western Mining Conference & Exhibition.10 x 8 inchesblack-and-white photographsCopyright retained by Colorado Mining Association.Mining competitionsViews -- InteriorMinersBoring -- CompetitionsThree men at a hand drilling event at a mining competitionStillImage