"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MNH4-Y3J : 20 February 2021), Mary Schwerbell in household of Louis Schwerbell, Appleton, Outagamie, Wisconsin, United States; citing enumeration district ED 115, sheet 70A, NARA microfilm publication T9 (Washington, D.C.: National Archives and Records Administration, n.d.), FHL microfilm 1,255,440.
"Wisconsin Births and Christenings, 1826-1926", database, FamilySearch (https://familysearch.org/ark:/61903/1:1:XR1F-XX4 : 30 January 2020), Mary Ann Cambell in entry for James L. Schwerble, 1877.
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