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1Published 1919Subjects: “...Coal....”
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2Published 1920Subjects: “...Coal....”
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3Published 1931Subjects: “...Coal....”
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4Published 1921Subjects: “...Coal....”
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5Published 1914Subjects: “...Coal....”
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6Published 1937Subjects: “...Coal mines and mining....”
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7Published 1913Subjects: “...Coal mines and mining....”
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8Published 1923Subjects: “...Coal mines and mining....”
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9Published 1930Subjects: “...Coal mines and mining....”
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10Published 1923Subjects: “...Coal. http://id.loc.gov/authorities/subjects/sh85027307...”
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11Published 1923Subjects: “...Coal. http://id.loc.gov/authorities/subjects/sh85027307...”
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12Published 1923Subjects: “...Coal. http://id.loc.gov/authorities/subjects/sh85027307...”
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13Published 1924Subjects: “...Coal. http://id.loc.gov/authorities/subjects/sh85027307...”
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14Published 1924Subjects: “...Coal. http://id.loc.gov/authorities/subjects/sh85027307...”
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15Published 1924Subjects: “...Coal. http://id.loc.gov/authorities/subjects/sh85027307...”
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16Published 1924Subjects: “...Coal. http://id.loc.gov/authorities/subjects/sh85027307...”
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17Published 1924Subjects: “...Coal. http://id.loc.gov/authorities/subjects/sh85027307...”
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18Published 1924Subjects: “...Coal mines and mining. http://id.loc.gov/authorities/subjects/sh85027364...”
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19Published 1923Subjects: “...Coal. http://id.loc.gov/authorities/subjects/sh85027307...”
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20Published 1923Subjects: “...Coal. http://id.loc.gov/authorities/subjects/sh85027307...”
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