Links:
[1] http://admin.indiaenvironmentportal.org.in/news/ongc-sets-gas-target-tripura
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/assam-tribune-guwahati
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/natural-gas-exploration
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/tripura
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/oil-and-natural-gas-corporation-ongc