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Following the great success of their AVATAR: THE LAST AIRBENDER comics and the Avatar: The Last Airbender—The Art of the Animated Series art book, Dark Horse and Nickelodeon have come up with a no-brainer: a new art book that has even MORE art from the Legend of Korra animated series.

The hardcover will contain hundreds of pieces of never-before-seen artwork created during the development of season one of the show. With commentary from show creators Michael Dante DiMartino and Bryan Konietzko throughout, the book goes on sales July 24th.
 
Kotaku has a bit more preview art:

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The AVATAR comics written by Gene Luen Yang have been among Dark Horse’s best selling books for a while now.