Environmental Resource Research Institute
Learn about this cutting edge research facility at Penn State, dedicated to the improvement of natural resources.

Environmental Systems Research Institute (ESRI)
The industry standard for GIS software, the creators of ArcView, ArcINFO, and ArcIMS.

United States Geologic Survey
Surf the website of the only science agency in the Department of the Interior. The USGS is an excellent source for information about our natural resources.