The following sources were used to document the early Groton Avery family.
- Sweet, Homer DeLois, Averys of Groton (Press of the Rice-Taylor Printing Co, Syracuse,NY,1894)
- Elroy McKendree Avery and Catherine Hitchcock (Tilden) Avery, The Groton Avery Clan, Cleveland, 1912
- History of Shiawassee and Clinton counties, Michigan, with illustrations and biographical sketches of their prominent men and pioneers; pages 385-386. Publication Info: Philadelphia ,: D.W. Ensign & co., 1880.
- American Biographical History of Eminent and Self-Made Men with Portrait Illustrations on Steel, Vols I, II, Ancestry.com.
The son of John Avery, 1798-1883, named Dr. John Avery is written about and with reference to Dr John Avery's father: His father served in the War of 1812.
- War of 1812 Service Records, Ancestry.com.
Noted that John Avery was taken prisoner. Probably served in Farrington's Regiment, New York Militia. Charles O'Dell's mother was a Farrington. Relevancy: A Charles O'Dell married Amy Avery, dau. of James Merritt Avery, son of John Avery.
- 1830 Chataugua Co, NY Federal Census, Ancestry.com.
Charlotte Twp where son James Merritt Avery was born.
- 1840 Jefferson County, NY Federal Census, Ancestry.com.
John Avery enumerated in Watertown, NY.
- 1850 Clinton County, Michigan Federal Census, Ancestry.com.
John Avery and family enumerated in Duplain Twp.
- 1860 Clinton County, Michigan Federal Census, Ancestry.com.
John Avery and family enumerated in Bingham Twp.
- 1880 Clinton County, Michigan Federal Census, Ancestry.com. Living alone with a servant.
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