"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MGHW-6VH : accessed 1 October 2021), Charles W Haag Jr. in household of Charles C Haag, Philadelphia Ward 41, Philadelphia, Pennsylvania, United States; citing enumeration district (ED) ED 1045, sheet 9A, family 185, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 1410; FHL microfilm 1,375,423.
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