till about five years ago, Gujarat's virdas
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/well-worth-it
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/down-earth
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/water-harvesting
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/traditional-knowledge
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/rural-technology
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/gujarat