"United States Census, 1860", database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MXHS-5S5 : 18 March 2020), James Ludon, 1860.
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MGSB-KN4 : accessed 1 January 2016), Mary Ludden in household of William J Kelly, Homestead Ward 1, Allegheny, Pennsylvania, United States; citing enumeration district (ED) ED 90, sheet 17A, NARA microfilm publication T624 (Washington, D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,375,307.
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