LINK INDIAN MINERAL YEAR BOOK 2019 COAL AND LIGNITE
https://ibm.gov.in/index.php?c=pages&m=index&id=1471
https://ibm.gov.in/writereaddata/files/09022020154002Coal_2019.pdf
https://ibm.gov.in/index.php?c=pages&m=index&id=1471
https://ibm.gov.in/writereaddata/files/09022020154002Coal_2019.pdf
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