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BBC Radio 4, Letter from America by Alistair Cooke, ‘The Forgotten William le Queux’, 13 May 1988, http://www.bbc.co.uk/programmes/articles/12VJn7Ghzkj3b8gC6CVHXpo/the-forgotten-william-le-queux-13-may-1988, accessed 2 August 2016.