Clifford mining company Clifford min. ore hauled, Black Hawk, Colorado. 1881 p.2 c.2 Mill operating, Gilpin co. Colo. R.M.News. Apr.20,1882 p.3 c.3 Erecting stamp mill, treatment, Clifford district , Colorado. R.M.Nsws. Mar. 16, 1882 p.6 c.2 Proposed activities, concentrator & mill, Clifford disc. Colo. R.M.News. Mar. 28, 1882 p.2 c.2 0
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