| 其他書名 | Held at National Bureau of Standards, Gaithersburg, Maryland, January 27-28, 1969 |
| 出版 | U.S. Department of Commerce, National Bureau of Standards ; [for sale] Washington, D.C., 1970 |
| URL | http://books.google.com.hk/books?id=-MA8AAAAIAAJ&hl=&source=gbs_api |
| EBook | FULL_PUBLIC_DOMAIN |