Cyrus Hugh Morrill and Ethel South

1. South Dakota Births, 1856-1903 (Electronic database at http://www.ancestry.com/).
2. Social Security Death Index.
3. Find a Grave Index (Ethel Marie South Morrill, d. 5 Oct 1969, Portland, Multnomah Co., Oregon), online at https://www.familysearch.org/ark:/61903/1:1:QV23-DSH4?lang=en (accessed 2026-07-11), Find a Grave Index, entry for Ethel Marie South Morrill. Name: Ethel Marie South Morrill | Birth Date: 5 March 1904 | Death Date: 5 October 1969 | Event Place (Original): Portland, Multnomah, Oregon, United States of America
4. Annie Morrill Smith, Morrill Kindred in America, Volume 2 (New York: Grafton Press, 1931), 350.
5. [Anonymous], California Death Records (Electronic database at www.rootsweb.com).
6. [Anonymous], California Death Records (Electronic database at www.rootsweb.com).
7. Social Security Death Index.
8. Social Security Death Index.