Ключевые слова: background, book, book shelf, bookcase, books on shelf, bookshelf, bookshop, bookstore, business, classic, cognition, collection, college, concept, cover, culture, education, group, hardcover, indoor, information, inside, interior, knowledge, learn, library, library books, literature, old, paper, pile, public, read, reading, research, row, sale, school, science, shelf, shop, stack, store, student, study, textbook, university, wisdom, wood,