"United States Census, 1880," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:MWX3-YJD : 14 January 2022), Jacob Koch, Hollidaysburg, Blair, Pennsylvania, United States; citing enumeration district , sheet , NARA microfilm publication T9 (Washington, D.C.: National Archives and Records Administration, n.d.), FHL microfilm .
"United States Census, 1930," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:2:1B3K-5B7 : accessed 20 July 2022), Household of Jacob Koch, Altoona, Blair, Pennsylvania, United States; citing enumeration district (ED) ED 18, sheet 33A, line 30, family 807, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 2004; FHL microfilm 2,341,738.
Find A Grave, database and images (http://findagrave.com : accessed 16 May 2017), memorial #132528661 for Jacob Gehr Koch (1856 - 1935) - Find A Grave Memorial.
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