Ключевые слова: book, books, bookstore, collection, college, color, colorful, cover, design, dictionary, education, element, encyclopedia, flat, group, heap, icon, illustration, information, knowledge, learn, learning, library, literature, object, office, paper, pile, read, red, school, science, sign, stack, study, studying, symbol, textbook, textbooks, university, vintage, web, white, wisdom,