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- [S202] Arthur Springer, History of Louisa County, Iowa, From its Earliest Settlement to 1911, 2 volumes (Chicago: S. J. Clarke Publishing Company, 1911), volume 2, page 280.
Biographical sketch of John Henry Otto.
"He was born in Marthasville, Missouri, now called Hopewell, in August, 1835, a son of Henry and Elizabeth (Rolfe) Otto, both of whom were natives of Hanover, Germany."
- [S202] Arthur Springer, History of Louisa County, Iowa, From its Earliest Settlement to 1911, 2 volumes (Chicago: S. J. Clarke Publishing Company, 1911), volume 2, page 280.
Biographical sketch of John Henry Otto.
John Henry Otto was a "son of Henry and Elizabeth (Rolfe) Otto, both of whom were natives of Hanover, Germany. The parents emigrated to America and made their home for a number of years in Missouri, later removing to Washington county, Iowa. They are both now deceased."
- [S175] Frances Gretchen (Klein) Leenerts, Descendants of Father Fiegenbaum (Chinook, Washington: F. Leenerts, 2002), page 29.
Louisa Otto, daughter of Henry Otto and Margueretha Rolfe, was born on 13 August 1832 in Fenne [sic], Hanover, Germany.
- [S202] Arthur Springer, History of Louisa County, Iowa, From its Earliest Settlement to 1911, 2 volumes (Chicago: S. J. Clarke Publishing Company, 1911), volume 2, page 280.
Biographical sketch of John Henry Otto.
"...Henry and Elizabeth (Rolfe) Otto, both of whom were natives of Hanover, Germany. ... In their family were nine children, one of whom died in infancy, the others being: George, of Portland, Oregon; Louisa, the wife of F. Feigenbaum [sic], of Wauneta, Kansas; John Henry, the subject of this sketch; Hortense, who became the wife of Henry Droegemeyer, of Burlington; Christian and William, both of whom are deceased; Herman, who is now living in Wapello; and Mary, who married Henry Wagoner, of Ankeny, Iowa."
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