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- Pennsylvania, United States183
- United States of America90
- Philadelphia, Pennsylvania, United States37
- West Branch Delaware River, Pennsylvania, United States27
- Chesapeake Bay Basin, Maryland, United States8
- Lycoming County, Pennsylvania, United States5
- Maryland, United States5
- Allegheny County, Pennsylvania, United States3
- Delaware, United States2
- Ohio, United States2
- Susquehanna River, Pennsylvania, United States2
- State College, Pennsylvania, United States1