| Sources |
- [S2538] South Dakota, Day County, FCR: Day Co., SD 1900, (http://www.ancestry.com: National Archives and Records Administration, 2004), T623, roll 1549, Highland, enumeration district (ED) 122, sheet 7A, p. 159, dwelling 116, family 117, Julis A. Handke, accessed 11 Dec 2025 (Reliability: 3).
- [S1241] Find A Grave, Find A Grave, ((http://www.findagrave.com/)), accessed 11 Dec 2025), memorial page for Julius Handke (unknown–9 Dec 1904), Find a Grave Memorial ID 212959899; citing Webster Cemetery, Webster, Day County, South Dakota, USA; Maintained by Gaikowski (contributor 49264516). (Reliability: 3).
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