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- [S1442] _Births, Deaths and Marriages, Victoria, Harold John Alsop; Death; Index; 23642; 1991.
- [S1287] 1911 England & Wales Census [FMP], Household of John Alsop; London; West Ham; RG14/9413; Schedule 332; ED 3; RD 188-3; 6 March 2023.
- [S1312] UK Civil Registrations [GRO], Harold John Alsop; Birth; 1902; Dec; West Ham; Vol. 4a; Page 238; 6 March 2023.
- [S1104] Billion Graves Cemetery Index, Corporal H J Alsop; 7939175; Springvale Botanical Cemetery; 6 April 2023.
- [S1066] Essex Marriages and Banns 1537-1935 Transcription [FMP], John Alsop + Alice Ford Heppel; 11 August 1898; West Ham; Essex Record Office Ref. D/P 256/1/46; Page 106; 6 March 2023.
- [S1087] England & Wales Marriages 1837-2005 [FMP], John Alsop + Alice Ford Heppel; Marriage; 1898; Sep; West Ham; Vol. 4a; Page 430; 6 March 2023.
- [S1445] _South Australia Vital Records [Genealogy SA], Harold John Alsop + Helene Nader; Marriage; Index; 318/644; 1929; Talunga.
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