Links:
[1] http://admin.indiaenvironmentportal.org.in/news/govt-starts-work-mega-sewer-network-clean-yamuna
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/indian-express-new-delhi
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/river-pollution
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/yamuna
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/sewage-treatment-plants-stp
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/sewage
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/delhi