| Sources |
- [S22741] Descendants of Squire Hascall and Elizabeth Chandler/Russell, (compiled by Richard K. Hascall for the Haskell Family Association).
- [S17566] 1910 census, Colorado, Archuleta county.
- [S42567] RootsWeb.com, Doxtater / Cooper GEDCOM f, (Derylin Ludwig), extracted June 2010 (Reliability: 0).
- [S53585] SSDI: Social Security Death Index.
- [S56538] Cemetery index, Bayfield Cemetery, Bayfield, La Plata, Colorado, (Find-a-Grave).
- [S30108] Marriage index, Colorado, La Plata county for G.B. Cooper and Edith Mack, Box 1 Folder 33 (Reliability: 0).
- [S42567] RootsWeb.com, Doxtater / Cooper GEDCOM f, (Derylin Ludwig).
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