| 其他書名 | Report of a Conference Held at the Office of the American Telephone and Telegraph Company, May 14 and 15, 1889, 18 Courtlandt Street, New York |
| 出版 | American Telephone and Telegraph Company, 1889 |
| URL | http://books.google.com.hk/books?id=LgUqAAAAYAAJ&hl=&source=gbs_api |
| EBook | FULL_PUBLIC_DOMAIN |