| 其他書名 | Hearing Before the Subcommittee on Science, Research, and Technology of the Committee on Science, Space, and Technology, U.S. House of Representatives, One Hundred First Congress, First Session, April 11, 1989 |
| 出版 | U.S. Government Printing Office, 1989 |
| URL | http://books.google.com.hk/books?id=Ew8rAAAAMAAJ&hl=&source=gbs_api |
| EBook | FULL_PUBLIC_DOMAIN |