America's Watersheds [Online] Available: http://seawifs.gsfc.nasa.gov/OCEAN_PLANET/HTML/peril_watersheds.html [1997, October 14]
Another Mussel Invasion of Ohio [Online] (1996). Available:http://www.obs.biosci.ohio-state.edu/mussels.htm [1997, October 28]
Causey, Ann S. 1991. Environmental Action Guide Benjamin/Cummings Publishing Inc. Redwood City, California.
The Environmental Protection Agency [Online] Available: http://ww.epa.gov/reg5ogis.html
Lew Rose. The Mississippi River: The Challenge of Sustainability [Online] Available: http://www.epa.gov/reg5ogis/sustain2.htm#Significance [1997, September 30]
ORSANCO [Online] Available: http://www.orsanco.org.html [1997, October 18]
The Woodshed Woodshed@deckernet.com [1997, December 16]
Realm Graphics www.ender-design.com/rg/index.html [1997, December 10]
The Web Developer's Virtual Library www.stars.comVlib/Authoring/Images_and_Icons.html [1997, December 16]