Abstract
the outstanding source of solid mineral fuel in the United States.' They have yielded, during approximately the past two centuries,2 almost eight billion tons of coal (Table I);3 and only during recent decades has their annual output been exceeded by that from the coal fields of West Virginia (Table II).4 No other state has yet succeeded in equalling the record annual output of bituminous coal established by Pennsylvania in 1918 (178,551,000 tons);5 and, with coal production of the nation experiencing a declining trend during recent years, it may at least be open to question whether such a record ever will
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