Thomas A. Thomson Biography, Charles Mix County, SD This biography is taken from the "Standard Atlas of Charles Mix County (1906)", published by Geo. A. Ogle & Co. Page 55 Transcribed by Joy Fisher, sdgenweb@yahoo.com and may be copied for non-profit purposes. All other rights reserved. Thomas A. Thomson arrived in 1880, filed on his tree claim Feb. 14, and established his residence on his homestead March 25, but did not file until in May. He was the first to locate north of the "government trail."