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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.' Johann Friedrich Wilhelm Hackmann, child of Gerhard Friedrick (John Fredrick) Hackmann and Anna Marie ToBrocke, was born in 1814. No place of birth mentioned.
- [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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