"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M9SL-7RX : accessed 28 September 2019), Albert Haltwig in household of 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.
Ancestry.com. U.S., Social Security Applications and Claims Index, 1936-2007 [database on-line]. Provo, UT, USA: Ancestry.com Operations, Inc., 2015.
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