Depicts Wilhelm Conrad Röntgen, awarded the first Nobel Prize in Physics for the discovery of X-rays, along with an X-ray tube and an atom.
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“Postcard and Spanish Postage Stamp Commemorating Wilhelm Conrad Röntgen.” Spain, 1967. Witco Stamp Collection, Box 2. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/3j333242c.
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