The U.S. book market declined 2.5 percent in 2011 as sales of e-books, which are lower priced than printed works, more than doubled within the category that includes fiction and nonfiction.

Publishers generated $27.2 billion in book sales, down from $27.9 billion in 2010, according BookStats, an annual report produced by the Association of American Publishers and the Book Industry Study Group. Units sold rose 3.4 percent to 2.77 billion...

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