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1Published 1922Subjects: “...Coal mines and mining....”
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2Published 1936Subjects: “...Bituminous coal....”
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4Published 1943Subjects: “...Coal mines and mining....”
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5Published 1943Subjects: “...Coal mines and mining....”
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6Published 1941Subjects: “...Coal mines and mining....”
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7Published 1956Subjects: “...Coal mines and mining....”
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8Published 1937Subjects: “...Coal mines and mining....”
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9Published 1886Subjects: “...Bituminous coal....”
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10Published 1919Subjects: “...Coal mines and mining....”
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11Published 1919Subjects: “...Coal mines and mining....”
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12Published 1919Subjects: “...Coal mines and mining....”
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13Published 1935Subjects: “...Coal mines and mining....”
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14Published 1952Subjects: “...Coal mines and mining....”
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15Published 1959Subjects: “...Coal mines and mining....”
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16Published 1969Subjects: “...Coal mines and mining....”
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17Published 1944Subjects: “...Coal mines and mining....”
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18Published 1941Subjects: “...Coal mines and mining....”
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19Published 1919Subjects: “...Coal mines and mining Law and legislation United States....”
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20Published 1911Subjects: “...Coal mines and mining Pennsylvania Westmoreland City....”
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