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9788437602974
Raymond Smullyan is the author of 'Como Se Llama Este Libro / What is the Name of this Book?: El Enigma de Dracula y Otros Pasatiempos Logicos / The Riddle of Dracula and other Logical Puzzles (Teorema / Theorem) (Spanish Edition)', published 2004 under ISBN 9788437602974 and ISBN 8437602971.
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