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2. Misc. Publication;R. G. Bailey,1995
3. Tech. Rep. Y-87-1;Environmental Laboratory,1987
4. Illinois Department of Natural Resources. 2001. Wetland testimony to Representative May September 20, 2001. Illinois Department of Natural Resources, Springfield, IL, USA.
5. LaGrange, T. 2001. Estimated acres of isolated wetlands in Nebraska. Nebraska Game and Parks Commission, Lincoln, NE, USA.