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    During the seventeenth century 'Bells Pits' was the type of mining used. This consisted of bore holes being dug into the ground to search for coal.

  • Illinois State Geological Survey Coal Mines in Illinois

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  • AP Environmental Science » Coal

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  • ChapterCOALPenn State College of Earth and

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  • Coal Basics — Coal Association of Canada

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  • Mining in IndonesiaPricewaterhouseCoopers

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  • Hazards Of Coal MiningCoalMiningscribd

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  • Types of miningStraterra

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  • Types of MiningGriffin Coal

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  • Different types of CoalCoal Types WAGriffin Coal

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  • A Primer On CoalInvestopedia

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  • Types of Coal MiningFEECO International Inc.

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  • Coal miningWikipedia

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  • COALA Fossil Fuel

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  • Mining Lights and HatsNational Museum of American History

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