Kolloch, M.H. Historically Important Original Autograph Manuscript Letter Written by M. H. Kolloch on His Way From Fairplay (Colorado Territory) To Paradise Valley (Arizona Territory), Bragging About His Discovery of the North Extension of the “Richest Mine” in the Now-abandoned Settlement of Brownsville (California), Enthusiastically Reporting on a Two-feet-Wide Ledge Stuffed With Free Gold, and Writing That He Needs To Build 200 Feet of Road Leading to the Mine. Fairplay, California: 14 October 1866.