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, 6 x 4.25, September 18, 1977. Untranslated letter to French economist Jacques Rueff, a member of the Academie francaise. In fine condition. Accompanied by the original mailing envelope addressed in Broglie's hand, incorporating his full name in the return address on the flap.
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