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1. National Fish Hatcheries in Pennsylvania

1996. Environmental Resources Research Institute. Boundaries of fish hatcheries on 1:24,000 USGS topographic maps, locations verified from the National Park Service list.

2. Oil And Gas Fields: Pennsylvania

1996. Environmental Resources Research Institute. Point locations of oil and gas fields from Pennsylvania Department of Environmental Resources, Bureau of Topographic and Geologic Survey /8PAGS/9 W...

3. Oil And Gas Wells: Pennsylvania

1996. Environmental Resources Research Institute. Point locations of oil and gas wells from Pennsylvania Department of Environmental Resources, Bureau of Topographic and Geologic Survey /8PAGS/9 We...