Web Links
Ground Water Atlas of the United States
http://capp.water.usgs.gov/gwa/gwa.html
EPA Groundwater and Drinking Water
USGS Ground Water Quality Overview
http://www.epa.gov/safewater/protect/98_305b_gwqchap.pdf
USGS Ground Water Protection Programs
http://www.epa.gov/safewater/protect/98_305b_protchap.pdf
Water Budgets and High Plains Aquifer (Ogallala)
http://water.usgs.gov/pubs/circ/circ1186/html/gw_dev.html
Nebraska groundwater information and hydrology glossary
http://www.casde.unl.edu/vn/aps/saltcreekblock/saltcreek/outlines/goundwater.htm