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The EFO Collector: Archive: Issue of December 1982
Keywords: stamp errors, stamp errors, EFO, Segal, Errors, Freaks and Oddities on U.S. Stamps: Question Marks in Philately, Westen, Shaulis, color shift on state birds and flowers, L-perforator, first days, American Philatelist, The S.P.A. Journal, 1982