First day cover created by Artmaster includes cachet depicting a 3D image of a nonexistent molecule. Stamp depicts chemical glassware. Envelope is signed by Herman S. Bloch, the inventor of the catalytic converter.
|Place of publication|
|View in library catalog|
Artmaster. “First Day Cover Commemorating the ‘Science of Chemistry.’” United States, 1976. Witco Stamp Collection, Box 6. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/x633f1090.
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