| 其他書名 | Subject series. Professional, scientific, and technical services. Summary |
| 出版 | U.S. Department of Commerce, Economics and Statistics Administration, U.S. Census Bureau, 2001 |
| URL | http://books.google.com.hk/books?id=2mz6GA_TXsEC&hl=&source=gbs_api |
| EBook | FULL_PUBLIC_DOMAIN |