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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,...
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2. Active Railroads: Pennsylvania

1996. Environmental Resources Research Institute. Location of active rail lines in Pennsylvania, digitized from 1:24,000 USGS topographic maps on a stable Mylar base.
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4. Coal Mined Areas: Pennsylvania

1996. Environmental Resources Research Institute. Location of mined areas, including surface and deep coal and non-coal mining. Data incomplete, areas not mapped when screened at small scales durin...
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5. Inactive Railroads: Pennsylvania

1996. Environmental Resources Research Institute. Location of inactive rail lines in Pennsylvania, digitized from 1:24,000 USGS topographic maps on a stable Mylar base.
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6. Landmarks in Pennsylvania

1996. Environmental Resources Research Institute. National Park Service information used to establish landmark boundaries on 1:24,000 USGS topographic maps.
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7. 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...
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8. Major Rivers: Pennsylvania

1996. Environmental Resources Research Institute. Major rivers as derived from Pennsylvania Dept. of Transportation's streams database, which is organized by county.
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9. 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.
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10. 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.