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- [S21694] John Campbell in entry for Clyde Kirby Thomas and Eliza Campbell, "Illinois, County Marriages, 1810-1940".
- [S21693] John Campbell in household of William Campbell, "United States Census, 1860".
- [S21695] John Campbell in household of William Campbell, "United States Census, 1870".
- [S21698] John H Campbell in household of William Campbell, "United States Census, 1880".
- [S586] 1880 Census Letcher Co KY, 20-589.
- [S21699] John H Campball, "United States Census, 1900".
- [S21696] John Campbell, "United States Census, 1910".
- [S21697] John Campbell, "United States Census, 1920".
- [S21700] John H. Campbell, "Kentucky Death Records, 1911-1961".
- [S21690] Jno. H. Campbell, "Kentucky Marriages, 1785-1979".
- [S77] Letcher County, KY Marriage Index, Marriage Book #6.
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