Great Valley Water-Resources Science Forum
http://va.water.usgs.gov/GreatValley/Index.htm

Karst Waters Institute
http://www.karstwaters.org/

National Cooperative Geologic Mapping Program in Virginia
http://ncgmp.usgs.gov/ncgmpactivities/ncgmpactivities/statesummary2?location_name=Virginia&active=true&inactive=true&edmap=true&fedmap=true&statemap=true

Leetown Science Center
http://www.lsc.usgs.gov/

National Cave and Karst Research Institute
http://www2.nature.nps.gov/nckri/

The Groundwater Foundation
http://www.groundwater.org/