Rara Avis concentration mill. Central City district. Colorado Machinery, National. exposition Denver. R. M. News. July 27, 1882 p.3 c.1 Mentioned. R. M. News. Oct. 5, 1882 p.3 c.1 Machinery exhibit, Natl. expos., Denver. R. t2. News. Aug. 6, 1882 p.6 c.3 Nearly completed. R. Mi. News. Jan. 15, 1882 p.3 a.4 Machinery. R. M. News. Jan. 22, 1882 p.7 c.3
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