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- [S34] Lambert, Susan Group Sheets, (31 Oct 1999), All descendants of Gerrit Schipperus are from the Family Group Sheets of Susan Lambert 5 November 1999.
- [S34] Lambert, Susan Group Sheets, (31 Oct 1999).
- [S112] W. Klaas van Schoneveld, Eenigenburg, p.168.
- [S57] Census, American, 1880, IL, Ward 8, Enum. Dist. 82, H.No. 264, F. No. 561.
- [S57] Census, American, 1900, IL, Ward 5, Enum. Dist. 112, H.No. 129, F. No. 296.
- [S108] Ancestry.com, 1920 Census: Cook County IL, Ward 32a, Enumeration District 2003, Sheet 413.
- [S57] Census, American, 1930 IL Census.
- [S108] Ancestry.com, Family Data Collection, April 2006.
- [S108] Ancestry.com, Wisconson Marriages pre-1907 - Vol. 26, p. 0396.
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