Search Constraints
You searched for:
Author
Environmental Resources Research Institute
Remove constraint Author: Environmental Resources Research Institute
Format
Files
Remove constraint Format: Files
Subject
Railroads
Remove constraint Subject: Railroads
1 - 2 of 2
Search Results
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.