Links:
[1] http://admin.indiaenvironmentportal.org.in/reports-documents/letter-west-bengal-pollution-control-board-ms-durgapur-steel-plant-dated-09042007
[2] http://admin.indiaenvironmentportal.org.in/category/publisher/west-bengal-pollution-control-board
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/iron-and-steel-industry-0
[4] http://admin.indiaenvironmentportal.org.in/thesaurus/steel-authority-india-sail
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/durgapur