| 其他書名 | From the West-Virginia State Line to Pittsburgh, Including the Mines on the Lower Yougghiogheny River |
| 出版 | Board of Commissioners for the Second Geological Survey of Pennsylvania, 1884 |
| URL | http://books.google.com.hk/books?id=qBQgRge4JF0C&hl=&source=gbs_api |
| EBook | FULL_PUBLIC_DOMAIN |