MY final antedating of "yellow pages" (1927)

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   From ProQuest.


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              New York Times  (1857-Current file).       New York, N.Y.: Jun 24, 1909.                   p. 1 (1 page) :
   Information of general interest to the public can be had by consulting Information Section, "Yellow Pages," in new Telephone Directory.--Adv.


      Display Ad 2 -- No Title
              The Washington Post  (1877-1954).       Washington, D.C.: Aug 3, 1925.                   p. 3 (1 page):
   ...the yellow pages of the Telephone Book. (...)
THE CHESAPEAKE AND POTOMAC
TELEPHONE COMPANY