Gregory mine. Central City district colorado History. R. M. News. Feb. 21, 1877 p.4 c.3 Operating. R. M. News. June 26, 1877 p.2 c.1 Activities. R. M. News. Aug. 21, 1877 p.4 c.4 Ore exhibit, state fair, Denver. R. M. News. Oct. 4, 1877 p.4 c.3 Dividends; statistics, 1877. R. M. News. Oct. 26, 1877 p.2 c.2 Visited by members, American institute. of mining. engineers. R. M. News. Aug. 22, 1882 p.4 c.2
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