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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 285.
Biographical sketch of John Henry Otto.
"On the 11th of August, 1859, Mr. Otto was married to Miss Charlotte Annie Weckman, a daughter of John and Elizabeth (Ringler) Weckman. ... Eight children were born to Mr. and Mrs. Otto, the youngest of whom died in infancy, the others being: ...Anna Charlotte, the wife of L. W. Gerth, of Wyanconda, Missouri...."
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