From Mashable -- EBooks popularity growing real fast ! What next -- K-12 Text Books !!!

Big, bigger, but not yet biggest: According to the Association of American Publishers's StatShot study released Thursday, ebooks made up nearly a quarter (22.55%, to be precise) of U.S. trade publishers' book sales last year. That's up from 17% in 2011 and just 3% in 2009.

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