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1
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2Published 1919Subjects: “...Coal mines and mining....”
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3Published 1943Subjects: “...Bituminous coal....”
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4
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5Published 1916Subjects: “...Coal mines and mining....”
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6
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7Published 1912Subjects: “...Coal mines and mining....”
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8Published 1943Subjects: “...Coal mines and mining....”
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9Published 1943Subjects: “...Coal mines and mining....”
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10Published 1950Subjects: “...Coal mines and mining....”
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11Published 1941Subjects: “...Coal mines and mining....”
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12
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13Published 1906Subjects: “...Coal mines and mining....”
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14
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15
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16Published 1920Subjects: “...Coal mines and mining....”
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17
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18
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19
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20Published 1942Subjects: “...Coal mines and mining....”
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