1. Wetlands of the American Midwest;Prince,1997
2. A Sand County almanac and sketches here and there;Leopold,1949
3. Of men and marshes;Errington,1957
4. Status and trends of prairie wetlands in the United States 1987 to 2009;Dahl,2014
5. The value of the world’s ecosystem services and natural capital;Costanza;Nature,1997