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- [S10] 1891 UK Census, RG12/1241/4/1 High Street, Holywell cum Needingworth (Reliability: 2).
Recorded as Osborn F Hart (M) Son b abt 1890 in Needingworth Age: 1 years
- [S11] 1901 UK Census, RG13/1480/57/22 Cromwell Road, St Ives (Reliability: 2).
Recorded as HART, Osborn F (M) Son b abt 1890 in Needingworth, Huntingdonshire Occupation:Scholar Age: 11 years Single
- [S2] Register of Births, St. Ives, Huntingdonshire Mar 1890 vol 3b page 282 (Reliability: 3).
- [S10] 1891 UK Census, RG12/1241/4/1 High Street, Holywell cum Needingworth (Reliability: 3).
Recorded as Osborn F Hart (M) Son b abt 1890 in Needingworth Age: 1 years
- [S11] 1901 UK Census, RG13/1480/57/22 Cromwell Road, St Ives (Reliability: 3).
Recorded as HART, Osborn F (M) Son b abt 1890 in Needingworth, Huntingdonshire Occupation:Scholar Age: 11 years Single
- [S243] Calculation from Max lifespan from own birthdate (Reliability: 2).
- [S4] Register of Marriages, Kings Lynn, Norfolk Jun 1888 vol 4B page 539 (Reliability: 3).
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