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Genre Postage stamps Remove constraint Genre: Postage stamps Creator ArtCraft Remove constraint Creator: ArtCraft Subject Postage stamps Remove constraint Subject: Postage stamps Subject Chemists Remove constraint Subject: Chemists Subject Postmarks Remove constraint Subject: Postmarks

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    • 1976

    Cachet created by ArtCraft depicts a male and female chemist working in a laboratory setting, with text reading, "A Century of Modern Chemistry." Cover signed by Glen Seaborg.