http://www.helium.com/knowledge/200988-how-does-the-health-of-a-river-affect-the-vitality-of-a-region.xml Helium.com > Environment (Other) > How does the health of a river affect the vitality of a region? en-us Copyright Helium.com Mon, 02 Feb 2009 15:31:02 GMT Mon, 02 Feb 2009 15:31:02 GMT