French physicist (1892-1987) known for his theory that matter has the properties of both particles and waves, who was awarded the 1929 Nobel Prize in Physics. ALS in French, one page both sides, 4.75 x 3.5, Institut de France letterhead, November 23, 1959. Untranslated letter mentioning the 100th anniversary of the birth of Max Planck. In fine condition.
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