Colorado. Centennial. 1976. Stamps Souvenirs card commemorating Colorado's admission into the union goes on sale July 26, 1976. RMN Jy 24, 1976 p.26 Stamp souvenirs will. be sold; listed. Post Jy 31, 1976 p.3 U.S. postage stamp commemorating centennial goes on sale My 21, 1977. Picture. RMN AP 14, 1977 p.8 Colo. statehood centennial commemorative stamp features columbine superimposed on mountains. Picture. Post Roundup Ap 24, 1977 p.25 0
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