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.
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ArtCraft. “First Day Cover Commemorating ‘A Century of Modern Chemistry.’” United States, 1976. Witco Stamp Collection, Box 6. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/6w924b86j.
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