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	Teachers overview primary sources contact us Gallery advertisements art books data diagrams diaries documents letters maps newpapers objects photographs About philosophy bibliography credits	Edmund Longyear Title: Photograph of Edmund Longyear Type: Photograph Date: no date Source: Minnesota Historical Society Description: Edmund J. Longyear was a mining engineer on the Mesabi Range. He was the first prospector to bring diamond drill technology to the Iron Range. He created a successful business by doing drilling for other prospectors and by investing in real estate.