| 其他書名 | Useful Stratigraphic Marker in the Upper Devonian Shale in Eastern Kentucky and Adjacent Areas of Ohio, West Virginia and Tennessee |
| 出版 | Energy Research and Development Administration, Technical Information Center, 1977 |
| URL | http://books.google.com.hk/books?id=RCsdcAOrUXkC&hl=&source=gbs_api |