Telephones. Colorado History of Telephone service in Colorado. The Bulletin Mountain States Telephone and Telegraph . Company Oct., 1935 p.3-8 (vertical file ) History of Colorado telephone company. Post May 5, 1949 p.45 The telephone in Colorado. Early history to the present. RMN April 19, 1959 P 30D Telegraph spans the plains. RMN April 19, 1959 p.30D, Centennial Edition Boulder, Colorado phones first to join national dial system. Post^ec. 29, 1959 P.3
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