| Sources |
- [S47909] 1940 census, Massachusetts, Worcester county, Year: 1940; Census Place: Athol, Worcester, Massachusetts; Roll: m-t0627-01645; Page: 2A; Enumeration District: 14-4 (Reliability: 3).
- [S43361] Social Security Applications and Claims Index, Name: Sigrid M Doubleday Gender: Female Birth Date: 23 Nov 1906 Death Date: 28 Feb 1999 Claim Date: 23 Nov 1971 SSN: 034307384 (Reliability: 3).
- [S53723] Death index, Massachusetts, Name: Sigrid A Doubleday Certificate: 020359 Death Place: Greenfield Death Date: 28 Feb 1999 Birth Place: Other Birth Date: 23 Nov 1906 Spouse: Warren N Doubleday (Reliability: 3).
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