The U.S. Geological Survey (USGS) has compiled all of its karst-related resources into one extensive Web site. At http://water.usgs.gov/ogw/karst/, users can find research publications, data, and key contact information, as well as an interactive map of all the karst aquifers in the country. The site also provides a variety of photographs of karst aquifers, which are a vital groundwater resource across the country.
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