"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M9SL-7R8 : accessed 28 September 2019), Julius Haltwig, Plymouth Township, Hennepin, Minnesota, United States; citing enumeration district (ED) 149, sheet 5B, family 97, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,240,770.
"Minnesota State Census, 1895," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MQ6W-SMK : 3 April 2016), Julius Hartwig, Plymouth, Hennepin, Minnesota; citing p. 24, line 21, State Library and Records Service, St.Paul; FHL microfilm 565,775.
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MPKF-V22 : accessed 28 September 2019), Julius Hartwig, Williamstown, Dodge, Wisconsin, United States; citing enumeration district (ED) ED 38, sheet 1A, family 12, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 1707; FHL microfilm 1,375,720.
"Arizona Deaths, 1870-1951," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:FLV6-6H5 : 16 May 2019), Julian Hartwig in entry for Paul August Hartwig, 25 Jun 1944; citing Phoenix, Maricopa, Arizona, reference 282, Department of Library and Archives, Phoenix, Arizona; FHL microfilm 2,135,637.
Ancestry.com. U.S., Social Security Applications and Claims Index, 1936-2007 [database on-line]. Provo, UT, USA: Ancestry.com Operations, Inc., 2015.
Find A Grave, database and images (https://www.findagrave.com : accessed 28 September 2019), memorial page for Julius Hartwig (28 Mar 1843–23 Oct 1916), Find A Grave: Memorial #15682751, citing Mount Olivet Chapel Cemetery, Plymouth, Hennepin County, Minnesota, USA ; Maintained by Find A Grave (contributor 8) .
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