Ключевые слова: adult, book, caucasian, closeup, collection, cultures, data, document, documents, education, equipment, expertise, food, hand, heap, holding, human, indoors, industry, learning, library, lifestyles, literature, males, material, men, occupation, office, old, one, paper, part of, person, pile, preparation, reading, research, sorting, stack, student, studying, table, textbook, unrecognizable, wisdom, women, wood, working,