Sales of print books fell just over 9 percent last year, according to Publishers Weekly.
Reporting on figures tracked by Nielsen BookScan, which tracks bookstores and many other venues, the fall was about the same as between 2010 and 2011, making an overall drop in print sales since 2010 of just under 16 percent.
Adult nonfiction fell most sharply, while juvenile nonfiction sales rose slightly.
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