Links:
[1] http://admin.indiaenvironmentportal.org.in/news/state-yet-use-eco-friendly-road-construction-technique
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/assam-tribune-guwahati
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/environment
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/roads
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/assam
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/road-transport
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/pradhan-mantri-gram-sadak-yojana