| 其他書名 | Their Occurrence, Petrography, and Comparison of Chemical and Physical Properties with Associated Bright Coals |
| 出版 | U.S. Government Printing Office, 1940 |
| URL | http://books.google.com.hk/books?id=SJg5Ss3vzwgC&hl=&source=gbs_api |
| EBook | FULL_PUBLIC_DOMAIN |