Ключевые слова: 3d, 3d icon, book, bookmark, bookstore, business, catalogue, collection, college, data, design, diary, dictionary, document, ebook, education, element, handbook, icon, icons, illustration, information, instruction, isolated, journal, knowledge, learning, library, magazine, manual, note, notebook, notepad, object, office, page, paper, publication, ribbon, school, schoolbag, sign, student, study, symbol, textbook, trendy, university, white,