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The top documents tagged [grades of coal]
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grades of coal
stacker_reclaimer
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Sources of energy
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CH. 10 CHAPTER 10. political and environmental issue OPEC – largely Arab countries – Organization of Petroleum Exporting Countries 1973 restricted.
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Chapter 17 Part 2. Fossil fuel deposits are not distributed evenly. There is an abundance of oil in Texas and Alaska, but very little in Maine. The eastern.
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