LINK 22-23COAL and LIGNITE RESOURCES
https://employee.gsi.gov.in/cs/groups/public/documents/document/dmkx/mtk4/~edisp/dcport1gsigovi1198702.pdf
https://employee.gsi.gov.in/cs/groups/public/documents/document/dmkx/mtk4/~edisp/dcport1gsigovi1198702.pdf
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