Hidden treasure mill. Gilpin county. Colorado. Stamps used by Calif. co. RMN INDEX R.M.News. Nov. 18, 1883 p. 3 c.2 Additional stamps; proposed operations, California mine co. R.M.News. Mar. 14, 1884 p. 2 c.6 Erection of stamps, Calif. min. co. R.M.News. Mar. 22, 1884 p. 2 c.2 Number of stamps. R.M.News. Apr. 25, 1885 p. 6 c.1
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