1. Rising Tide. The Great Mississippi Flood of 1927 and How It Changed America;Barry,1997
2. The Last Frontier Forests: Ecosystems and Economies on the Edge;Bryant,1997
3. The Congo River Basin;Campbell;The World's Largest Wetlands: Ecology and Conservation,2005
4. The value of the world's ecosystem services and natural capital;Costanza;Nature,1997
5. Rivers of the World;Czaya,1983