| Sources |
- [S22741] Descendants of Squire Hascall and Elizabeth Chandler/Russell, (compiled by Richard K. Hascall for the Haskell Family Association).
- [S53634] Death index, California, (Ancestry.com. California, Death Index), Name: William J Knapp Social Security #: 296075633 Gender: Male Birth Date: 11 Sep 1916 Birth Place: Canada Death Date: 15 Jan 1986 Death Place: Los Angeles Mother's Maiden Name: Capella (Reliability: 3).
- [S32954] 1920 census, Ohio, Stark county.
- [S53634] Death index, California, (Ancestry.com. California, Death Index), Name: Maude Agnes Knapp Social Security #: 561214877 Gender: Female Birth Date: 10 Dec 1892 Birth Place: Pennsylvania Death Date: 28 Dec 1979 Death Place: Los Angeles (Reliability: 3).
- [S55045] Ancestry.com, KNAPP, (HFA library call number Internet2244).
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