Colorado.. Taxation:. Chain store tax Chain stores assail tax exemption for oil corporations. Post May 3, 1937 p.1 Action is begun to refer chain store tax. Post Sept. 23, 1937 p.10 Gamble-Skogmo stores in Colorado win chain store exemption. Post Apr. 21, 1938 p.31 Chain price lower says Denver university . survey. RMN Oct. 21, 1938 p.10 Supreme court rules' agency stores' must pay chain levy. Post Mar W, 1939 p.7 0