Digital Maps and Geospatial Data | Princeton University
Map of a group of iron mines in Morris County
- Geological Survey of New Jersey
- [Trenton, N.J.] : Geological Survey of New Jersey, 1867.
Relief shown by contours and spot heights. From: Geological survey of New Jersey : maps. [Trenton, N.J. : State Geologist, 1868]. Iron mines shown in red. "Note. The curved lines denote the contours of the hills, formed by horizontal planes at the distance of 20 feet apart. The numbers upon the summits of the hills denote their height in feet." "Lith. Julius Bien ... New York."
- Iron mines and mining—New Jersey—Morris County—Maps and Morris County (N.J.)—Maps
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- Princeton: Historic Map Division, Special Collections, Firestone Library