Ключевые слова: africa, black, blue, cars, city, clouds, coal, coalpit, colliery, color, colorful, crank, day, elevator, energy, equipment, evening, ewald, germany, gold, hamm, herten, history, industry, iron, landscape, machinery, metal, mine, mining, morning, night, orange, ore, partking, pit, platinum, red, rise, ruhrareal, shaft, silhouette, sun, sunrise, sunset, technology, tower, trees, winch, yellow,