LINK Indian Coal and Lignite Resources-2021
https://employee.gsi.gov.in/cs/groups/public/documents/document/b3zp/otq0/~edisp/dcport1gsigovi944710.pdf
https://employee.gsi.gov.in/cs/groups/public/documents/document/b3zp/otq0/~edisp/dcport1gsigovi944710.pdf
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