| Sources |
- [S27342] Genealogical History of Deer Isle Families, Series 2, Volume 16, Haskell, (compiled by Benjamin Lake Noyes).
- [S47602] 1940 census, Maine, Knox county, Year: 1940; Census Place: Camden, Knox, Maine; Roll: T627_1482; Page: 16A; Enumeration District: 7-6 (Reliability: 3).
- [S53672] Marriage index, Maine, Name: Sylvan R Knowlton Gender: Male Residence: Camden, ME Spouse's Name: Josephine S Welch Spouse's Gender: Female Spouse's Residence: Camden, ME Marriage Date: 17 Feb 1935 Marriage Place: Maine, USA (Reliability: 3).
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