The Groundwater Foundation is a nonprofit organization that is dedicated to informing the public about one of our greatest hidden resources, groundwater (
http://www.groundwater.org/
)
Excellent site dedicated to educating public on groundwater issues from a Canadian perspective. (
http://www.ec.gc.ca/water/en/nature/grdwtr/e_gdwtr.htm
)
The Toxic Substances Hydrology Program provides objective scientific information to improve characterization and management of contaminated sites, to protect human and environmental health, and to reduce potential future contamination problems. (
http://toxics.usgs.gov/
)
The Ground Water Atlas of the United States presents a comprehensive summary of the Nation's ground-water resources, and is a basic reference for the location, geography, geology, and hydrologic characteristics of the major aquifers in the Nation (
http://capp.water.usgs.gov/gwa/gwa.html
)
The National Speloelogical Society was founded to advance the study, conservation, exploration, and knowledge of caves around the world. Lots of great cave pictures on this site. (
http://www.caves.org
)
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