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104 State Water Plan Watersheds: Pennsylvania pennsylvania-state-university

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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3.75-Minute Quarter Quadrangle Boundary: Pennsylvania pennsylvania-state-university

2003. Pennsylvania Spatial Data Access. Index of USGS quarter-quadrangles (3.75 minute) covering Pennsylvania. The polygons are attributed with information pertaining to the USGS/PaGS Dig...

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Active Railroads: Pennsylvania pennsylvania-state-university

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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Breeding Bird Atlas 2 - Grid: Pennsylvania pennsylvania-state-university

2004. This Website provides an interface for PA Breeding Bird Atlas staff and volunteers to find survey blocks, enter their findings and view results. I ...