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1. 104 State Water Plan Watersheds: Pennsylvania

1998. Environmental Resources Research Institute. Digitized boundaries of 104 major watersheds defined in the Pennsylvania state water plan. The State Water Plan, originally developed in the 1970s,...

2. Fish Species Occurrence Database: Pennsylvania

1998. Pennsylvania Fish and Boat Commission. Historical listing (1975-1995) of Pennsylvania fish species occurrences, as documented at 10,780 sampling points on streams and rivers throughout t...

3. Major River Basins: Pennsylvania

1998. Environmental Resources Research Institute. This polygon layer delineates the boundaries of 8 major watersheds in Pennsylvania that have shown through past vertebrate inventory collection rec...

4. Networked streams of Pennsylvania

1998. Environmental Resources Research Institute. The connected network of streams and waterways of Pennsylvania are indicated as single lines in this coverage. Waterways are given connected topolo...

5. PA Explorer: Terrabyte Image: Pennsylvania

1998. Wayne Myers. The Terrabyte images are extractives from Landsat Thematic Mapper images through the SpectraPlex process. This process does not permit the full res...

6. Preliminary Landform Subdivisions of Pennsylvania

1998. Pennsylvania Bureau of Topographic and Geologic Survey, Department of Conservation and Natural Resources. The land surface of Pennsylvania is anything but flat and horizontal. The surface comprises complex arrangements of differences in elevation above ...