2012 to be revenue tipping point for e-books, says Publishing Technology report - 24 Mar 2011

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"It showed that one in four UK academic publishers were already seeing 10 percent of their total book revenue coming from e-books in 2011, with double that predicting this would be the case in 2012."

That means that 3 out of 4 get less than 10% of their revenue from e-books.