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1Published 1928Subjects: “...Coal mines and mining Environmental aspects Pennsylvania....”
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2Published 1928Subjects: “...Coal mines and mining Environmental aspects Pennsylvania....”
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5Published 1907Subjects: “...Coal....”
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6Published 1907Subjects: “...Coal....”
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7Published 2003Subjects: “...Coal mine accidents Pennsylvania....”
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8Published 1942Subjects: “...Coal mines and mining....”
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9Published 1837Subjects: “...Coal mines and mining....”
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10Published 1837Subjects: “...Coal mines and mining....”
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11Published 1889Subjects: “...Strikes and lockouts Coal mining Pennsylvania....”
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12Published 1913Subjects: “...Coal mines and mining....”
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13Published 1913Subjects: “...Coal mines and mining....”
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14Published 1913Subjects: “...Coal mines and mining....”
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15Published 1908Subjects: “...Coal mines and mining....”
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16Published 1913Subjects: “...Coal United States Transportation....”
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17Published 1888Subjects: “...Strikes and lockouts Coal mining Pennsylvania....”
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18Published 1911Subjects: “...Coal mines and mining Pennsylvania Westmoreland City....”
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19Published 1993Subjects: “...Coal miners Legal status, laws, etc. United States....”
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