The Sign of the Four
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The Sign of the Four Sources and ClassicNote Author

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  • Sir Arthur Conan Doyle. The Complete Sherlock Holmes. New York City: Doubleday & Company, Inc., 1970.
  • Merriam-Webster. Merriam-Webster, n.d. Web. 07 Nov. 2016.
  • Philip K Wilson. "Sir Arthur Conan Doyle: British Author." Encyclopedia Britannica . November 7, 2016. <https://www.britannica.com/biography/Arthur-Conan-Doyle>.
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