"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M3K3-QXF : accessed 12 November 2019), Agnes Koch in household of Charles G Koch, Election District 12, Precinct 1, Baltimore, Maryland, United States; citing enumeration district (ED) 53, sheet 6A, family 100, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,240,607.
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