Stamp on souvenir sheet depicting Max Planck, a rocket, and the planet Earth. Planck won the Nobel Prize in Physics in 1918 (the stamp incorrectly identifies his Nobel Prize as 1914). Max Planck is known as the father of quantum theory, and as the discoverer of the quantum and of "Planck's constant." The souvenir sheet depicts a profile of Alfred Nobel in gold.
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Vásárhelyi, Gyula László. “Postage Stamp on Souvenir Sheet from the Ivory Coast Commemorating Max Planck's Nobel Prize in Physics.” Côte d'Ivoire, 1978. Witco Stamp Collection, Box 3. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/j9602068s.
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