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Probably Michael HEFFERNEN's sons: Thaddeus and Jonathan (or Thomas)
188? tin-type Kewaunee Co. WI
Michael HEFFERNEN farmed 1855-1904 in Franklin Twp., Kewaunee Co. WI
From the Catherine Heffernen Moore Albums.
Catherine Heffernen-Moore (1874.WI-1958.OR daughter of Michael) taught school in Kewaunee County, WI and after 1906 in Snohomish County, WA for many decades.