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- [S1312] UK Civil Registrations [GRO], Douglas Walter Allsopp; Birth; 1919; March; Doncaster; Vol. 9c; Page 1205; 5 June 2025.
- [S1285] 1921 England Census [A], Household of Walter Allsopp; Staffordshire; Tamworth; RG15/12901; Schedule 239; ED 5; RD 366; 5 June 2025.
- [S1010] The Ryerson Index, Central Coast Express Advocate; Death Notice; Douglas Walter Allsopp; 28 August 2002; 5 November 2025.
- [S919] Newspaper: Tamworth Herald, Staffordshire, UK [FS], Marriage Notice; Walter Allsopp + Miriam Brindley; 15 October 1910; Page 8; Viewed; 1 January 2021; https://www.familysearch.org/ark:/61903/1:1:QPCK-VXMK.
- [S1312] UK Civil Registrations [GRO], Walter Allsopp + Miriam Brindley; Marriage; 1910; December; Tamworth; Vol. 6b; Page 814; 5 June 2025.
- [S1447] _Births, Deaths and Marriages, NSW, Douglas Walter Allsopp + Effie Joan Marlow; Marriage; Transcript; 2426; 1940; Marrickville.
- [S1395] Sydney, Australia, Anglican Parish Registers, 1814-2011 [A], Marriage; Douglas Walter Allsopp + Effie Joan Marlow; 1 January 1939; Marrickville, St Clements; No. 163; 5 June 2025.
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