Lower Susquehanna NAWQA Fact Sheet
National Water Quality Assessment Program - an overview
Pennsylvania State Fact Sheet
Susquehanna River Watershed - NYSDEC
USGS WRIR 98-4245: Distribution of Major Herbicides in Ground Water of the U.S.
national water-quality assessment program - USGS Water
PDF) Naturally occurring contaminants in the Piedmont and Blue Ridge crystalline-rock aquifers and Piedmont Early Mesozoic Basin siliciclastic-rock aquifers, Eastern United States, 1994-2008
USGS NAWQA STUDY UNIT CLICKABLE MAP
national water-quality assessment program - USGS Water
Susquehanna River's nitrogen levels threatening Chesapeake Bay - Baltimore Post-Examiner
Rolling Through The Appalachians, 53% OFF