As the market quickens for "e-books," the schedule for their release is slowing down.
Simon & Schuster announced Wednesday that the electronic editions for more than 30 works coming out in the first half of 2010 would not be available until four months after the hardcover.
The affected books include volumes by Don DeLillo, Karl Rove and Mary Higgins Clark.
Publishers and authors have worried that e-books might take sales from hardcovers, which cost more.
E-books have already been held back for several of the fall's leading titles. Those include the late Sen. Edward Kennedy's "True Compass," Sarah Palin's "Going Rogue" and Andre Agassi's "Open."
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