LOC's Public Domain Archive
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![Geological map of the Potomac basin west of Blue Ridge, Virginia and West Virginia : showing the relations of its upper Potomac coal basin and the iron-ore bearing areas in reference to the West Virginia Central and Pittsburg [sic] R.R., and its connections and extensions /](https://cache.getarchive.net/Prod/thumb/cdn18/L3Bob3RvLzIwMTkvMTEvMjkvZ2VvbG9naWNhbC1tYXAtb2YtdGhlLXBvdG9tYWMtYmFzaW4td2VzdC1vZi1ibHVlLXJpZGdlLXZpcmdpbmlhLWFuZC13ZXN0LXZpcmdpbmlhLWVhYWQxMS0xMDI0LmpwZw%3D%3D/40/26/webp "Geological map of the Potomac basin west of Blue Ridge, Virginia and West Virginia : showing the relations of its upper Potomac coal basin and the iron-ore bearing areas in reference to the West Virginia Central and Pittsburg [sic] R.R., and its connections and extensions /")