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You searched for: Author Environmental Resources Research Institute Remove constraint Author: Environmental Resources Research Institute Subject Railroads Remove constraint Subject: Railroads Institution Penn State Remove constraint Institution: Penn State
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1. 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.

2. 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.