Links:
[1] http://admin.indiaenvironmentportal.org.in/data-statistics/provisional-coal-statistics-2017-18
[2] http://www.indiaenvironmentportal.org.in/files/file/ProvisionalCoalStat2017-18.pdf
[3] http://admin.indiaenvironmentportal.org.in/category/publisher/ministry-coal
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/coal
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/coal-india
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/coal-industry
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/india
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/statistics
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/exports
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/imports