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- [S58] National Archives and Records Administration, 1850 United States Federal Census, Yonkers, Westchester County, New York, National Archives Microfilm Roll M432_615; 1850 United States Federal Census [database on-line]., (Lehi, UT, USA: Ancestry.com Operations, Inc., 2009).
- [S11] Holland Society of New York, U.S., Dutch Reformed Church Records in Selected States, 1639-1989 [database on-line]., (Provo, UT, USA: Ancestry.com Operations, Inc., 2014).
- [S59] National Archives and Records Administration, 1870 United States Federal Census, Poughkeepsie Ward 5, Poughkeepsie Post Office, Dutchess County, New York, National Archives Microfilm Roll M593_927; 1870 United States Federal Census [database on-line]., (Lehi, UT, USA: Ancestry.com Operations, Inc., 2009).
- [S205] Obituary of John Garrison Ryer, (Yonkers, NY: The Yonkers Statesman, 30 Aug 1921, p. 6).
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