Ключевые слова: background, big, blank, book, concept, concepts, copy, cover, data, document, education, encyclopedia, expertise, hardcover, history, horizontal, information, intelligence, isolated, knowledge, learn, learning, library, literary, literature, media, object, old, open, page, paper, pen, print, publication, read, reading, research, school, science, sheet, stack, story, study, studying, text, textbook, university, white, wisdom, write,