Berks County Conservancy
Delaware Riverkeeper
Natural Lands Trust
Nature Conservancy
National Register of Historic Places
PA Department of Conservation and Natural Resources
Pennsylvania Department of Enviromental Protection
Pennsylvania Organization for Watersheds and Rivers
Pennsylvania State Data Access
Penn State Cooperative Extension
Pine Creek Valley Watershed Association
Schuylkill River Greenway Association
Upper Perkiomen Valley Watershed Coalition
U.S. Department of Agriculture
Environmental Protection Agency
U.S. Fish and Wildlife Service
U.S. Geologic Survey