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printed instructional and teaching materials and curriculum catalogs in the fields of reading, literature, literacy, science, mathematics and history, children's illustrated activity books, books for children featuring interactive learning pieces, namely, repositionable letters, words and objects, children's learning-activity books; children's books combined with pre-recorded educational and entertainment audiocassettes or videocassettes sold as a unit; children's song books; series of fiction books; series of non-fiction books in the fields of literature, history, science and mathematics; textbooks in the fields of math, science, social studies, reading, and history; printed puzzle books; children's learning boards, namely, printed and illustrated cardboard panels featuring inset, repositionable die-cut words and objects, sold as a unit, wall posters