Ключевые слова: antique, art, background, book, book opened, bookstore, business, closeup, concept, continuous line, cover, design, document, drawing, education, education concept, flat, gesture, graphic, hand drawn, hard cover, hardcover, illustration, information, isolated, journal, knowledge, learn, library, line, line drawing, literature, object, one line, open, page, pages, paper, read, school, simple colored, stack, stack of books, study, symbol, text, textbook, university, vector design,