Ключевые слова: abstract, black, book, bookcase, bookshelf, classics, collection, college, data, design, document, education, expertise, future, group, hardcover, heap, icon, info, information, isolated, knowledge, learn, library, literary, literature, object, old, open, page, paper, read, research, row, school, science, shelf, stack, study, symbol, textbook, university, vertical, white, wisdom, writing,