Ключевые слова: aged, antique, background, book, brown, collection, college, concept, cover, document, education, expertise, green, heap, information, knowledge, learn, library, literary, literature, natural, nature, object, old, open, outdoor, page, paper, park, pile, read, research, retro, row, school, science, shelf, stack, student, study, teaching, text, textbook, training, university, vintage, white, wisdom, writing, yellow,