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8 janv. 1972 - Kentucky became the leading coal-producing state.
Ajouté au bande de temps:
19 févr. 2018
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Coal, Wind, Water, and Solar Energy (1900-Present)
Coal (Blue)
Solar (Green)
Water (Orange)
Wind (Purple)
Date:
8 janv. 1972
Maintenaint
~ Il y a 52 ans