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- [S315] [Herndon-2024] Herndon, William Robert, Lindell-Herndon Genealogy, Washington, District of Columbia: By the author, 2024.
- [S9] [Bonnell-1997] Herndon, William Robert (interviewer), "Interview of Judith Ann (Bonnell) Lindell".
- [S145] [Hennepin-1992] "Death Certificate of Casper Oscar Bonnel".
- [S150] [US-SSA-1936a] "Social Security Card - Casper Oscar Bonnell," Washington, District of Columbia: Social Security Administration, 1936.
- [S69] [US-1920-1b] "1st Ward, Fond du Lac City, Fond du Lac County, Wisconsin," Fourteenth Census of the United States, 1920,
Washington, District of Columbia: National Archives and Records Administration (NARA), publication T625, roll 1986, E.D. 30, sheet 3A.
- [S1303] [US-1930-3d] "Taycheedah Township, Fond du Lac County, Wisconsin," Fifteenth Census of the United States, 1930,
Washington, District of Columbia: National Archives and Records Administration (NARA), publication T626, roll 2573, E.D. 20-51, sheet 3A.
- [S1304] [US-1940-2o] "Ward 17, Fond du Lac, Fond du Lac County, Wisconsin," Sixteenth Census of the United States, 1940,
Washington, District of Columbia: National Archives and Records Administration (NARA), publication T627, roll 4479, E.D. 20-29, sheet 2B.
- [S151] [StCharles-1977] "St. Charles Cemetery - Deed for Section 6, Block 116, Lot 5," register 175.
- [S1479] [WHS-1895a] "Registration of Marriages: Fred J. Bonnel and Katie S. Hoffman," Wisconsin Pre-1907 Vital Records Collection: Marriage Records, Madison, Wisconsin: Wisconsin Historical Society, Fond du Lac Volume 6, page 19, number 2261.
- [S144] [FondduLac-1937] "Marriage Certificate of Casper Oscar Bonnell and Anna Marie Jarvis," file 358.
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