John Winston Spencer Churchill, 7th Duke of Marlborough: Political Papers, GBR/0012/MS Add.9271. Cambridge University Library.
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John Winston Spencer Churchill, 7th Duke of Marlborough: Political Papers, GBR/0012/MS Add.9271. Cambridge University Library. https://archivesearch.lib.cam.ac.uk/repositories/2/resources/8491 Accessed December 11, 2024.