1.  Clermont County Office of Environmental Quality.  http://www.oeq.net/oeq/wqreport98/table1.htm 1998.

2.  The Hach Company.  Important Water Quality Factors. http://www.hach.com/h2ou/h2wtrqual.htm

3.  North Carolina State University.  Wetland Managment. http://h2osparc.wq.ncsu.edu/info/wetlands/manage.html

4.  United States Environmental Protection Agency.  http://www.epa.gov/owow/wetlands/types/marsh.html

5.  United States Geological Survey.  Classification of Hardness.  http://www.usgs.gov

6.  United States General Services Administration.  National Environmental Policy Act.
        http://hydra.gsa.gov/pbs/pt/call-in/factshet/1296/12_96_3.htm

7.  Vander Leeden, Frits; Keith Todd, David; L. Troise, Fred. The Water Encyclopedia.  Lewis Publishers:1990