Links
 Rutgers University Dept. of Earth & Environmental Sciences |
 Palisades Interstate Park Commission |
 Pennsylvania Geological Survey |
 US Environmental Protection Agency |
 United States Geological Survey |
 U.S. Department of Agriculture |
 New Jersey Geological Survey |
 Connecticut Geological Survey |
 The Highlands Coalition |
 The New York State Geological Survey |
HiRIS: Highlands Regional Information System | Highlands Regional Assessment Update |