Ключевые слова: background, blank, book, booklet, bookmark, catalog, closed, closeup, college, colours, concept, cover, document, education, empty, handbook, hardcover, idea, information, isolated, knowledge, learning, library, literacy, literature, novel, object, old, open, page, paper, publication, read, retro, school, single, space, stack, story, study, text, textbook, wisdom,