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19 janv. 1971 - Surface mines replaced underground mines as the leading source of coal produced in the United States. The importance of surface mining has continued to grow since that time.
Ajouté au bande de temps:
Coal, Wind, Water, and Solar Energy (1900-Present)
By
Sarah Winters
19 févr. 2018
0
0
316
Date:
19 janv. 1971
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~ Il y a 53 ans
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