Commemorative cover with a cachet honoring the Parforex XXI and a "Salute to the Space Telescope Orbital Launching by Space Shuttle Columbia," signed in blue ballpoint, "Clyde W. Tombaugh, Discovered 9th planet, Pluto, on 18 Feb 1930," and in black ballpoint, "Gene Shoemaker," "Carolyn Shoemaker," and "Lyman Spitzer, Jr." In fine condition.
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