"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MS1X-JH4 : accessed 8 February 2020), Peter Gillen, Precinct 1 Allegheny city Ward 9, Allegheny, Pennsylvania, United States; citing enumeration district (ED) 75, sheet 2A, family 20, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,241,356.
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