anthracite
background
biomass
black
calorific
carbon
coal
combustion
cost
dark
dirty
effect
energy
environment
extract
fossil
fossil fuels
fuel
heaps
heat
heater
hot
industrial
industry
lignite
lump
lumps
material
metallurgical
mine
mining
natural
natural material
natural stone
piece
power
prices
quarry stone
resources
shine
shovel
solid
station
stone
stone lumps
storage
texture
types
unclean
定額
Large chunks of coal in a shovel. Fuel for the boiler. House heating.の素材 [FY310162633435]
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