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Joseph Thomas Martz Stamp Collection
註釋There are twenty-nine covers in this collection issued from 1967 to 1969, with three significant ones. The first is the man on the moon cover, released on 20 July and 9 September 1969 in two cities, and therefore bears two date stamps. The second is the flag cover for 20 January 1969, which bears the stamp "Inauguration Day." The third is the George C. Marshall cover, issued in 1967. In addition to the commemorative Marshall stamp, the cover has a stamp of "21" on it and a decorative cachet commemorating General George C. Marshall. Additionally, there is a postcard with a portrait of Marshall by Christine B. Pogue, an officially issued note describing the numbered envelope, and a note from Martz on obtaining the envelope with cachet, stamp, and postcard.