French physicist known for his theory that matter has the properties of both particles and waves and recipient of the 1929 Nobel Prize in Physics. ALS in French, one page both sides, 4.75 x 3.5, Institut de France, Academie des Sciences letterhead, July 9, 1949. Neatly penned letter to a gentleman in which he agrees to write an article for a scientific almanac. In fine condition. R&R COA.
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