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1Published 1890“...Aid for school of mines in Colorado...”
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2Published 1914Subjects: “...Strikes and lockouts Coal mining Colorado....”
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3Published 1914Subjects: “...Strikes and lockouts Coal mining Colorado....”
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4Published 1914Subjects: “...Strikes and lockouts Coal mining Colorado....”
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5Published 1914Subjects: “...Coal mines and mining Colorado....”
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6Published 1914Subjects: “...Coal mines and mining Colorado....”
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7Published 1914Subjects: “...Coal mines and mining Colorado....”
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8Published 1914Subjects: “...Coal mines and mining Colorado....”
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9Published 1914Subjects: “...Coal mines and mining Colorado....”
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10Published 1914Subjects: “...Coal mines and mining Colorado....”
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11Published 1914Subjects: “...Coal mines and mining Colorado....”
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12Published 1914Subjects: “...Coal mines and mining Colorado....”
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13Mining Experiment Station in Colorado. hearings before the United States House Committee on Mines...Published 1911Connect to the full text of this electronic book
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14Mining Experiment Station in Colorado. hearings before the United States House Committee on Mines...Published 1912Connect to the full text of this electronic book
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15Labor difficulties in the coal fields of Colorado. Letter from the President of the United States...Published 1916“...Labor difficulties in coal fields of Colorado in 1914 and 1915...”
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16Published 1938“...Transferring mine rescue car to Colorado...”
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20Published 1913“...Colorado....”
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