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- [S1127] Ancestry.com, Cook County, Illinois, Marriages Index, 1871-1920, (Name: Ancestry.com Operations, Inc.; Location: Provo, UT, USA; Date: 2011;).
- [S16] Ancestry.com, 1900 United States Federal Census, (Name: Ancestry.com Operations Inc; Location: Provo, UT, USA; Date: 2004;), Year: 1900; Census Place: Braceville, Grundy, Illinois; Roll: 303; Page: 21B; Enumeration District: 0044; FHL microfilm: 1240303.
- [S2625] Obituary of Gertrude Knudtson - Mason City Globe Gazette - 1970, (Name: Mason City Globe Gazette; Location: Mason City IA; Date: 9 Mar 1970;), Mason City Globe Gazette 9 March 1970.
...she was married to Carl Knudtson at Gardner, Ill., in September 1899. . . . Her husband died in 1922.
- [S16] Ancestry.com, 1900 United States Federal Census, (Name: Ancestry.com Operations Inc; Location: Provo, UT, USA; Date: 2004;), Year: 1900; Census Place: Braceville, Grundy, Illinois; Roll: 303; Page: 21B; Enumeration District: 0044; FHL microfilm: 1240303.
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