| 其他書名 | Hearings Before the United States Senate Committee on Labor and Public Welfare, Special Subcommittee on the National Science Foundation, Ninety-First Congress, First Session, on May 7, 1969 |
| 出版 | U.S. Government Printing Office, 1969 |
| URL | http://books.google.com.hk/books?id=l99FAQAAMAAJ&hl=&source=gbs_api |
| EBook | FULL_PUBLIC_DOMAIN |