9 Educational, instructional and informational products, namely, prerecorded [ audiotapes, videotapes, ] compact disks, digital video disks and printed materials in the nature of study guides, faculty manuals and textbooks featuring information in the fields of history, government, health, philosophy, sociology, psychology, environmental education, business, citizenship, English literature, English as a Second Language, civics education, family literacy, geology, oceanography, physics, marriage and family, all sold as a unit for use in secondary, adult and higher education