"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M39K-8XC : accessed 7 April 2021), Theodore Harmon, West Goshen Township, Precinct 2 West Chester borough, Chester, Pennsylvania, United States; citing enumeration district (ED) 120, sheet 6B, family 122, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,241,394.
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MGZQ-GY8 : accessed 7 April 2021), Theodore Harmon, West Chester, Chester, Pennsylvania, United States; citing enumeration district (ED) ED 74, sheet 1B, family 22, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 1329; FHL microfilm 1,375,342.
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XHD4-YS8 : accessed 7 April 2021), Theodore Harmon, West Chester, Chester, Pennsylvania, United States; citing enumeration district (ED) ED 92, sheet 7B, line 70, family 203, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 2021; FHL microfilm 2,341,755.
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