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- [S127] Will of Gerardus Willse, 19 Jan 1759, Morrisania, Westchester County, New York.
- [S6] William S. Pelletreau, Early Wills of Westchester County, New York: from 1664 to 1784: a Careful Abstract of all Wills (nearly 800) recorded in New York Surrogate's Office and at White Plains, N.Y. from 1664 to 1784 : also the Genealogy of "the Havilands" of Westchester County and Descendants of Hon. James Graham (Watkinson and Ackerley Families): with Genealogical and Historical Notes, (New York: F. P. Harper, 1898).
- [S128] Collections of the New York Historical Society for the Year 1895, (New York, NY: New York Historical Society, 1895).
- [S21] Ancestry.com, New York, U.S., Wills and Probate Records, 1659-1999 [database on-line]., (Lehi, UT, USA: Ancestry.com Operations, Inc., 2015).
- [S124] The New York Genealogical & Biographical Record, Volume 116, (New York, NY: Genealogical and Biographical Society, 1985).
- [S129] Henry B. Hoff, Genealogies of Long Island Families from the New York Genealogical and Biographical Record, Volume 1, (Baltimore, MD: Genealogical Publishing Company, 1987).
- [S130] Jerome Wiltsee, A Genealogical and Psychological Memoir of Philippe Maton Wiltsee and his Descendants, (Atchison, KS: G. W. Myers, 1908).
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