ThinkCentral is an all-in-one learning site that provides access to digital books, activities, readers, and more. Sign in at ThinkCentral to access online material available at Houghton Mifflin Harcourt’s ThinkCentral Web site.
TumbleBook Library is an online collection of TumbleBooks – animated, talking picture books which teach kids the joy of reading in a format they'll love. TumbleBooks are created by adding animation, sound, music and narration to existing picture books in order to produce an electronic picture book which you can read, or have read to you. Sign in at TumbleBooks.