"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M32W-3PX : accessed 31 October 2017), Laura M Zimmerman in household of Isaac C Zimmerman, Election Districts 23-24, Ballenger, Braddock, Frederick, Maryland, United States; citing enumeration district (ED) 36, sheet 5B, family 100, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,240,622.
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M2FR-SZ7 : accessed 31 October 2017), Laura M Zimmerman in household of Isaac C Zimmerman, Ballenger, Frederick, Maryland, United States; citing enumeration district (ED) ED 81, sheet 6B, family 132, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 565; FHL microfilm 1,374,578.
"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M6QG-K9D : accessed 31 October 2017), Laura M S Zimmerman in household of Isaac C Zimmerman, Ballenger, Frederick, Maryland, United States; citing ED 91, sheet 8A, line 41, family 120, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 673; FHL microfilm 1,820,673.
Obituary in the Post (Frederick, MD), Monday, February 21, 1938. Transcribed at Find A Grave: Memorial #156820083
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