The Valley of Fear


  1. ^ Doyle, Arthur Conan (October 1979). John Murray, ed. The Sherlock Holmes Omnibus (2nd Illustrated Edition ed.). ISBN 071953691X.  CS1 maint: Extra text (link)
  2. ^ Adrian Flynn adaptation of The Valley of Fear. Oxford University Press. 2004. ISBN 978-0-19-832085-2. 

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