First Day Cover commemorating the 75th anniversary of the American Chemical Society
- 1951
Cachet depicts two chemists working in a laboratory.
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Cite as
“First Day Cover Commemorating the 75th Anniversary of the American Chemical Society.” United States, 1951. Witco Stamp Collection, Box 5. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/w9505056r.
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