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You searched for: Creator Environmental Resources Research Institute Remove constraint Creator: Environmental Resources Research Institute Subject Railroads Remove constraint Subject: Railroads Time Period 1950-1999 Remove constraint Time Period: 1950-1999

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1.
Datasets datasets

Active Railroads: Pennsylvania Datasets datasets 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. The Pennsylvania State University.

2.
Datasets datasets

Inactive Railroads: Pennsylvania Datasets datasets pennsylvania-state-university

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. The Pennsylvania State University.