coal is a valuble rock mined in Indiana
coal.
There is very little coal left in England as most of it has already been extracted.
oil coal gas
Early Texas settlers undoubtedly mined both coal and lignite from numerous ... Most mines were small, yielding between 10,000 and 50,000 tons per year.
they mined rocks for coal.
Mines in which the coal was mined.
Coal and lead can be mined in Iowa.
Lignite
Lignite
Bituminous coal and limestone are mined in Indiana.
its mined by coal im 99.9% sure