Trading stamps Frontier Gas, A.G. stores add trading stamps. Post Jan. 13, 1957 Clips: Denver. Business 100 grocery stores in state to use new "Mor-Valu" trading stamps. Post Mar. 12, 1957 p.19 House kills bill that would have imposed $5,000 license fee on trading stamp companies. Post Mar. 26, 1957 p.13 Opinions of different stores about stamp war. Post May 21, 1958 p.2
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