1. Coal India was once a significant fuel source in the residential and commercial sector.
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5. Coal India is extracted from the Earth using one of two major techniques, sub-surface or surface mining.
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12. Coal India is mined by two principal methods, underground and surface operations, and both practices are widely used in the United States.
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15. Coal India is extracted from Earth using one of two major methods: sub-surface or surface mining.
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21. Coal India Limited, a holding company, is a state-owned mining corporation and the largest coal producer in India.
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25. Coal India Limited produces coal through seven of its wholly owned subsidiaries.
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