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J. O.
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National Portrait Gallery, London
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Parliamentary Archives of the United Kingdom
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John Rylands University Library of Manchester
King's College, Cambridge
National Archives of Canada, Ottawa
Cambridge University Library
National Archives of Scotland, Edinburgh
Bodleian Library, Oxford
British Library, London
National Library of Ireland, Dublin
Proceedings of the British Academy
University of Newcastle upon Tyne, Robinson Library
Boston Public Library, Massachusetts
University of St Andrews Library
Churchill College, Churchill Archives Centre, Cambridge