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Image challenge

You would like to consult the book by Isidore Galactique entitled "Saint Nicolas, les coulisses de la magie".
Only one library has this book. You check online if the book is available and go to the library. By chance, you bump into your bookseller friend Gérémy Poitudhie, who lives nearby.
What is the Dewey number of this book?
(Exemple : 532.9 HKO 7743051)