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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.
"The Gerald Hackmann Family." Gerhard Friedrich (or Frederick) Hackmann (1821-1889) married Maria Engel Steinkamp (1820-1900).
- [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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