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- [S355] United States Government, Census - main, (Censuses conducted 1790-1930), 1820 & 30, Vermont, Addison, Cornwall, Francis Grove head of household (Reliability: 3).
- [S720] Elroy McKendree Avery and Catharine Hitchock Tilden Avery, Avery Clan, (Cleveland, 1912), pp455-6 (Reliability: 3).
- [S355] United States Government, Census - main, (Censuses conducted 1790-1930), 1820, 30 US Vermont, Addison, Cornwall. Year est from childrren ages in 1820, place of marriage from birthplace of mother. (Reliability: 3).
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