Ключевые слова: adult, background, black, both hands, caucasian, close, coal, dark, dirt, dirty, discovery, energy, exchange, farmer, fingers, grunge, hand, holding, horizontal, human, industry, job, lump, male, man, mechanic, men, mine, miner, mineral, old hands, outdoors, palm, part, person, piece, power, showing, soil, soot, stone, top, toughness, underground, unhygienic, up, white, work, worker, wrinkles,