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Researchers: Biogas could provide new life for Illinois coal mines
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Researchers: Biogas could provide new life for Illinois coal mines
Bituminous coal - Energy Education
What are the different types of coal? | American Geosciences Institute
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Bituminous coal (5.5 cm across) | Bituminous coal is a highe… | Flickr
We Thought You Should Know: The 4 Types of Coal and Their Uses
Bituminous coal | (public display, Geology Department, Witte… | Flickr
SIC Code 1222 - Bituminous coal underground