The Simplon Casino, Inc.

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Receipt issued to John Peter De Lancey by Monmouth Lyon, December 14, 1816

Letter from John Peter De Lancey to Thomas Jones, December 19, 1791

Certificate issued by the Overseers of the Poor of the Town of Mamaroneck to John Peter De Lancey, exonerating him from liability for maintenance of former slaves, July 5, 1803

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Receipted bill issued by J. Pratt to John Peter De Lancey for $13.00, July 14, 1818

Letter from John Peter De Lancey to Thomas Jones, March 13, 1792

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Letter from John De Lancey to John Peter De Lancey, January 9, 1791

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Men in Service, Geo. J. O'Neill. "Send to Mrs. Joseph Ireland, 27 Park Avenue, Mamaroneck."