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- [S123] Iowa, Births and Christenings Index, 1800-1999, Ancestry.com, (Name: Ancestry.com Operations, Inc.; Location: Provo, UT, USA; Date: 2011;), Database online.
Record for Otto Johann Ferdinand Jahn
- [S130] U.S., World War I Draft Registration Cards, 1917-1918, Ancestry.com, (Name: Ancestry.com Operations Inc; Location: Provo, UT, USA; Date: 2005;), Database online. Registration Location: Crawford County, Iowa; Roll: 1642994; Draft Board: 0.
Record for Otto John Jahn
- [S13] 1930 United States Federal Census, Ancestry.com, (Name: Ancestry.com Operations Inc; Location: Provo, UT, USA; Date: 2002;), Database online. Year: 1930; Census Place: Denison, Crawford, Iowa; Roll: 650; Page: 1A; Enumeration District: 5; Image: 405.0.
Record for Otto Jahn
- [S114] Ancestry Family Trees, (Name: Online publication - Provo, UT, USA: Ancestry.com. Original data: Family Tree files submitted by Ancestry members.;), Database online.
Record for Otto Johannes JAHN
- [S116] 1920 United States Federal Census, Ancestry.com, (Name: Ancestry.com Operations, Inc.; Location: Provo, UT, USA; Date: 2010;), Database online. Year: 1920; Census Place: Mitchell Ward 3, Davison, South Dakota; Roll: T625_1716; Page: 7A; Enumeration District: 73; Image: .
Record for Otto Jahn
- [S5] 1900 United States Federal Census, Ancestry.com, (Name: Ancestry.com Operations Inc; Location: Provo, UT, USA; Date: 2004;), Database online. Year: 1900; Census Place: Hanover, Crawford, Iowa; Roll: T623_426; Page: 1B; Enumeration District: 61.
Record for Carl John
- [S70] 1940 United States Federal Census, Ancestry.com, (Name: Ancestry.com Operations, Inc.; Location: Provo, UT, USA; Date: 2012;), Database online. Year: 1940; Census Place: Milford, Crawford, Iowa; Roll: T627_1152; Page: 5A; Enumeration District: 24-17.
Record for Otto John
- [S64] Cook County, Illinois, Marriages Index, 1871-1920, Ancestry.com, (Name: Ancestry.com Operations, Inc.; Location: Provo, UT, USA; Date: 2011;).
Record for Bertha Krause
- Details: Marriage certificate.
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