heavy duty truck at a coal mine
Palabras clave
coal,
fossil fuel,
energy,
mining,
industry,
power,
black,
resource,
natural,
carbon,
combustion,
fuel,
mine,
deposit,
seam,
transportation,
export,
import,
economy,
market,
supply,
demand,
reserve,
consumption,
process,
equipment,
machinery,
stockpile,
storage,
pile
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