Heather Fletcher is senior content editor with Target Marketing.

Earlier this month, research company Flurry ( reported that between April and July, the number of digital book application users increased by 300 percent. In July, Flurry tracked nearly 3 million active e-book application users on smartphones. While these numbers may make many book publishers think, "We need to start offering this," a number of publishers already are active in the mobile e-book application space, including Houghton Mifflin Harcourt (HMH).

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