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- [S2] Register of Births, Birkenhead, Cheshire Mar 1877 vol 8A page 529 (Reliability: 3).
- [S12] 1911 UK Census, RG14PN145 RG78PN5 RD2 SD2 ED6 SN179 Ladbroke Terrace Mews, Kensington Central, Kensington, London (Reliability: 2).
Recorded as CARTER, Bertha (F) Wife b abt 1877 in Birkenhead Cheshire Age: 34 years (Married 3 years) Married
- [S433] 1921 UK Census, RG15/00454/116/- Hay's Mews, St George's Hanover Square, St George's Hanover Square, Mdx (Reliability: 2).
Recorded as Bertha Carter (Female) Wife b abt 1877 in Birkenhead, Cheshire, England Occupation:Home Duties Age: 44 years 4 months Married
- [S12] 1911 UK Census, RG14PN145 RG78PN5 RD2 SD2 ED6 SN179 Ladbroke Terrace Mews, Kensington Central, Kensington, London (Reliability: 3).
Recorded as CARTER, Bertha (F) Wife b abt 1877 in Birkenhead Cheshire Age: 34 years (Married 3 years) Married
- [S433] 1921 UK Census, RG15/00454/116/- Hay's Mews, St George's Hanover Square, St George's Hanover Square, Mdx (Reliability: 3).
Recorded as Bertha Carter (Female) Wife b abt 1877 in Birkenhead, Cheshire, England Occupation:Home Duties Age: 44 years 4 months Married
- [S243] Calculation from Max lifespan from own birthdate (Reliability: 2).
- [S4] Register of Marriages, Brentford, Middlesex Sep 1908 vol 3A page 205 (Reliability: 3).
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