"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M3WS-12Z : 22 January 2015), Mary Cassidy in household of William Cassidy, Philadelphia city Ward 22, Philadelphia, Pennsylvania, United States; citing sheet 4B, family 71, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,241,463.
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