Ключевые слова: background, blank, book, books, collection, color, cover, data, dictionaries, dictionary, document, education, expertise, group, hardcover, heap, information, isolated, journal, journals, learning, library, literature, magazine, magazines, manual, manuals, nobody, objects, order, page, pages, paper, reading, research, row, school, stack, text, textbook, textbooks, variation, view, volume, volumes, white, wisdom,