George and Catherine Shackle: Letters to Stephen Frowen and Papers, GBR/0012/MS Add.8816. Cambridge University Library.
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George and Catherine Shackle: Letters to Stephen Frowen and Papers, GBR/0012/MS Add.8816. Cambridge University Library. https://archivesearch.lib.cam.ac.uk/repositories/2/resources/8026 Accessed April 26, 2025.
