"Michigan Births and Christenings, 1775-1995", database, FamilySearch (https://familysearch.org/ark:/61903/1:1:F4PY-J3X : 17 January 2020), William Ludden, 1878.
"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MWSN-JP6 : 26 August 2017), Willie Ludden in household of Thomas Ludden, Kalamazoo, Kalamazoo, Michigan, United States; citing enumeration district ED 135, sheet 209A, NARA microfilm publication T9 (Washington, D.C.: National Archives and Records Administration, n.d.), FHL microfilm 1,254,586.
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