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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 Friedrick (John Fredrick) Hackmann born 1789-1844 [sic]...." "He was one of the first trustees of the Immanuel Evangelical Church of Hostein."
- [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 Friedrick (John Fredrick) Hackmann born 1789-1844 [sic]...."
- [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.'
Henry Hackmann's father, John F. Hackmann, died in 1844.
- [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. 279.
Death and burial records. Johann Friedrich Hakmann [sic] died 11 September 1844 at the age of 55 years, 1 month.
- [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.
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