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- [S35] Immanuels United Church of Christ, The History of Our Church, 1839-1989: One Hundred Fifty Years (Holstein, Missouri: Immanuels United Church of Christ, 1989), p. 336.
Family history entitled 'The Gerald Hackmann Family.' Gerhard Friedrich (also spelled Frederick) Hackmann, child of "Gerhard Friedrick (John Fredrick) Hackmann" (1789-1844) and "Anna Marie ToBrocke" (1786-1860) was born in 1821.
- [S103] Portrait and Biographical Record of St. Charles, Lincoln, and Warren Counties, Missouri: containing portraits and biographical sketches of prominent and representative citizens of the counties, together with biographies and portraits of all the presidents of the United States (Chicago, Illinois: Chapman Publishing Company, 1895), p. 276.
A biographical sketch of 'Hon Henry Hackmann.'
"A native of Germany, our subject was born in the kingdom of Hanover, in 1824. He was the youngest member of the family of John F. and Mary (Tobroke) Hackmann, also natives of the Fatherland, where they spent their entire time in agricultural pursuits until emigrating to the New World, in 1835, a tedious journey in those days. The parents were accompanied by their family and Frederick Hackmann, grandfather of our subject. They at once made their way to this state and took up a tract of land in Warren County, near the present home of our subject."
- [S35] Immanuels United Church of Christ, The History of Our Church, 1839-1989: One Hundred Fifty Years (Holstein, Missouri: Immanuels United Church of Christ, 1989), p. 336.
Family history entitled 'The Gerald Hackmann Family.' Gerhard Friedrich (also spelled Frederick) Hackmann, son of "Gerhard Friedrick (John Fredrick) Hackmann" (1789-1844) and "Anna Marie ToBrocke" (1786-1860) died in 1889.
- [S35] Immanuels United Church of Christ, The History of Our Church, 1839-1989: One Hundred Fifty Years (Holstein, Missouri: Immanuels United Church of Christ, 1989), p. 336.
Family history entitled 'The Gerald Hackmann Family.' Gerhard Friedrick and Anna Marie ToBrock were married in 1810. No place is mentioned. The couple had seven children.
- [S35] Immanuels United Church of Christ, The History of Our Church, 1839-1989: One Hundred Fifty Years (Holstein, Missouri: Immanuels United Church of Christ, 1989), p. 336.
Family history entitled 'The Gerald Hackmann Family.' "Gerhard Frederick Hackmann married Maria Engel Steinkamp in 1841. She was born in 1820-1900 [sic]. They were loyal members of church. They had ten children." No place of marriage was explicitly mentioned.
- [S118] St. Charles County Genealogical Society, Femme Osage United Church of Christ, Femme Osage, Missouri: Baptisms, Marriages, Burials (St. Charles, Missouri: St. Charles County Genealogical Society, no date), pages 31, 51.
Marriage record for "Gerhard Fr. Hakmann" of Warren County and "Engel Steinkamp." Married 17 June 1841.
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