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Buzzati's book is a perfect example of a story which I'm certain many adults would love, yet it's published via the New York Review of Books Children's Collection, thus making its home the shelves of YAX, a land not frequented by many adults without a child in mind. Buzzati has works in both the adult and YAX sections, as do: Roald Dahl, J
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In an attempt to know the product I'm surrounded by, I try to read a few YAX titles, which are usually books I'd otherwise never come across. "Grimble" (Clement Freud/McSweeney's), Against the Odds (Marjolin Hof), The Wolves of Willoughby Chase (Joan Aiken), The Magician's Elephant (Kate DiCamillo) and Pam Munoz Ryan's forthcoming, The Dreamer, are all YAX titles I read last year; they stand proudly on their own as quality literature and are some of the best I read in '09.
I suppose the bottom line is this: a good YA title should be able to be read by adults. So if you're at a blank as to what your next read will be while perusing the regular fiction, you should give the Young Adult section a go.
Also, if you want to read more about the publishing aspect of YA vs. Adult, check this article out from the NY Times.