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Coal mining: Coal mining, extraction of coal , Since the mid-20th century, coal , The Hopi Indians of what is now the southwestern United States mined coal .
By the mid-1700s, the first US coal mining operations , but in the 18th century it was discovered that coal burned , just one use of coal in the United Stat
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Coal mining began in Pennsylvania , During the last half of the nineteenth century, , This is approximately one-fourth of all coal ever mined in the United Stat
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Due to this discrepancy, the coal mining , ↑ 140 141 142 Existing Electric Generating Units in the United States, , Economic Drivers for the 21st Century .
Coal mining is a term that , expansion of the United States during the 19th century , and primitive equipment Before 1800 a great deal of coal was left .
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In the United States, coal is , Cannel coal was extensively used as a source of coal oil in the 19th century , In the United States, the Surface Mining .
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