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2Published 1870Subjects: “...Coal mines and mining....”
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4Published 1921Subjects: “...Coal mines and mining....”
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5Published 1922Subjects: “...Coal mines and mining....”
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6Published 1922Subjects: “...Coal mines and mining....”
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7Published 1943Subjects: “...Bituminous coal....”
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8Published 1936Subjects: “...Bituminous coal....”
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9Published 1912Subjects: “...Coal leases Alaska....”
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10Published 1984Subjects: “...Coal leases Colorado....”
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11Published 1871Subjects: “...Coal mines and mining....”
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12Published 1913Subjects: “...Republic Coal Company....”
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13Published 1919Subjects: “...Coal mines and mining....”
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14Published 1922Subjects: “...Coal mines and mining....”
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15Published 1936Subjects: “...Bituminous coal industry....”
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16Published 1986Subjects: “...Coal trade United States....”
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17Published 1979Subjects: “...Coal gasification....”
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18Published 1979Subjects: “...Coal gasification....”
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19Published 1979Subjects: “...Coal gasification....”
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20Published 1979Subjects: “...Coal gasification....”
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