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1. Chesapeake Bay region state boundaries

1996. Penn State ORSER/ERRI. Boundaries for the states in the Chesapeake Bay region.

2. Landmarks in Pennsylvania

1996. Environmental Resources Research Institute. National Park Service information used to establish landmark boundaries on 1:24,000 USGS topographic maps.

3. National forests in Pennsylvania

1996. Environmental Resources Research Institute. Boundary information from the office of the Allegheny National Forest, taken from 1:24,000 USGS topographic maps.

4. National parks in Pennsylvania

1996. Environmental Resources Research Institute. National Park Service list and boundaries from 1:24,000 USGS topographic maps.

5. National Wildlife Preserves in Pennsylvania

1996. Environmental Resources Research Institute. Boundaries of National Wildlife Preserves in Pennsylvania. Boundaries were provided by the United States Department of the Interior, National Fish ...

6. Spring Creek Watershed boundaries: Pennsylvania

1996. Environmental Resources Research Institute. Geographic boundaries of the Spring Creek Watershed.

7. Spring Creek Watershed buffer boundaries: Pennsylvania

1996. Environmental Resources Research Institute. Shows 1 km. buffer zone bounding the perimeter of the Spring Creek Watershed.