The German Post Office Berlin honored Max Planck with a 30-pfennig stamp in the series "Men from Berlin's History
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Captured 2026-08-15 from Wikipedia. The archived copy is preserved so this citation survives link rot.
The German Post Office Berlin honored Max Planck with a 30-pfennig stamp in the series "Men from Berlin's History
Captured 2026-08-15 from Wikipedia. The archived copy is preserved so this citation survives link rot.