Ключевые слова: background, binder, blank, blue, book, business, collection, color, copy, cover, design, diary, document, education, empty, group, handbook, hardcover, hardcover book, heap, information, isolated, knowledge, learn, library, literature, message, mockup, note, notebook, notepad, object, office, page, paper, pile, reading, red, research, school, science, sheet, space, stack, study, text, textbook, university, white, wisdom,