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First Day Cover commemorating the XV Colloquium Spectroscopicum Internationale

  • 1969

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Cachet depicts a light beam passing through a prism to create a spectrum. Stamp depicts colors of the spectrum. The 15th Colloquium Spectroscopicum Internationale was held May 26-30, 1969 in Madrid, Spain.

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  • Courtesy of Science History Institute

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  • Box 5

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S.F.C., and Fábrica Nacional de Moneda y Timbre (Spain). “First Day Cover Commemorating the XV Colloquium Spectroscopicum Internationale.” Spain, 1969. Witco Stamp Collection, Box 5. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/08612n619.

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