Postcard written from German Theoretical Physicist, Max Planck (1858-1947) and his wife, Marga Planck née von Hoesslin to German Nazi industrialist, Alfried Krupp (1907-1967).
Planck, Max, and Planck, Marga, née von Hoesslin. “Postcard from Max and Marga Planck to Alfried Krupp Von Bohlen Und Halbach,” August 16, 1942. Box Small Collections. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/p9szmja.
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