Jonathan G. Wynkoop died at Syracuse, N. Y., Thursday, aged eighty-one years. He was in the book business from 1843(?) to 1870 and sold books to the Rev. Richard F. Cleveland from which Grover Cleveland studied as a schoolboy, at Fayetteville.

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Source:

Unknown, "Deaths of Noted People, Jonathan G. Wynkoop," The Adirondack News, St. Regis Falls, New York, Saturday, 28 October, 1905, Page 8.