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C. Douglas Singer. Medical, Invalid and General Life Assurance Society, 25 Pall Mall, London; 38 St John's Park, Upper Holloway, London; 55 The Common, Upper Clapton, London.
Archer, William H., C. Douglas Singer. Medical, Invalid and General Life Assurance Society, 25 Pall Mall, London; 38 St John's Park, Upper Holloway, London; 55 The Common, Upper Clapton, London. (1850-1890), [UMA-IT-000047090]. University of Melbourne Archives, accessed 30/04/2026, https://archives.library.unimelb.edu.au/nodes/view/511710