Researchers measured the environmental impact of coalbed methane extraction on local water quality.

The geologists mapped several coalbeds that could be mined sustainably over the next decade.

The old coalbins behind the farmhouse rattled when the wind blew.

She opened the old coalbin to find the furnace fuel nearly gone.

The museum displayed a rare coalball from the Carboniferous, revealing perfectly preserved plant tissues.

My grandfather's coalburner, a bulky iron stove, has been passed down through three generations.

Geologists mapped a coalbearing seam that extended for miles beneath the valley.