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- [S19017] 1910 census, Iowa, Clayton county, Year: 1910; Census Place: Guttenberg, Clayton, Iowa; Roll: T624_397; Page: 8A; Enumeration District: 0064 (Reliability: 3).
- [S54196] Birth index, Iowa, Name: Clarance C Jenkins Birth Date: 24 Nov 1900 Birth Place: Guttenburg, Clayton, Iowa Father: B C Jenkins Mother: Rose A Dubbles FHL Film Number: 1255481 (Reliability: 3).
- [S53585] SSDI: Social Security Death Index, Name: Clarence Jenkins Social Security Number: 340-07-5112 Birth Date: 24 Nov 1900 Issue Year: Before 1951 Issue State: Illinois Last Residence: 53813, Lancaster, Grant, Wisconsin, USA Death Date: Aug 1984 (Reliability: 3).
- [S10317] 1900 census, Iowa, Clayton county, Year: 1900; Census Place: Jefferson, Clayton, Iowa; Page: 4; Enumeration District: 0054 (Reliability: 3).
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