| 其他書名 | Hearings Before the Subcommittee [of the Committee] on Mines and Mining, House of Representatives, Sixty-fifth Congress, Second Session, on Investigation for Utilization of Lignite Coals as Fuel. June 7, 1918 |
| 出版 | U.S. Government Printing Office, 1917 |
| URL | http://books.google.com.hk/books?id=czMwAAAAYAAJ&hl=&source=gbs_api |
| EBook | FULL_PUBLIC_DOMAIN |