"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MGZ4-DZN : accessed 1 October 2022), Jacob B Zimmerman in household of Amos H Zimmerman, East Earl, Lancaster, Pennsylvania, United States; citing enumeration district (ED) ED 36, sheet 4B, family 94, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 1353; FHL microfilm 1,375,366.
"United States World War I Draft Registration Cards, 1917-1918", database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:K6VZ-2CJ : 26 December 2021), Jacob Burkhart Zimmerman, 1917-1918.
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