Ключевые слова: book, collection, college, cover, culture, data, document, education, educational, group, hardcover, heap, information, isolated, knowledge, learn, library, literacy, literary, literature, many, nobody, paper, pile, read, research, row, school, science, snack, stack, student, study, teach, teaching, text, textbook, tome, tower, training, university, white, wisdom, yellow,