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Continue to ChatRobert Gregory Mine (historical) Map - Knox County, KY https://www.yellowmaps.com/usgs/topo.cfm?map=ky-2554722-robert-gregory-mine-%28historical%29
Robert Gregory Mine (historical) Map - Knox County, KY https://www.yellowmaps.com/usgs/topo.cfm?map=ky-2554722-robert-gregory-mine-%28historical%29