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- Pennsylvania, United States78
- Allegheny County, Pennsylvania, United States7
- Philadelphia, Pennsylvania, United States6
- United States of America4
- West Branch Delaware River, Pennsylvania, United States3
- Chesapeake Bay Basin, Maryland, United States2
- Delaware River, Delaware, United States2
- Lehigh Valley, Pennsylvania, United States2
- Allegheny National Forest, Pennsylvania, United States1
- Butler County, Pennsylvania, United States1
- Maryland, United States1