| 其他書名 | Interregional Flow Patterns and Transportation Requirements in 1985 |
| 出版 | Agricultural Experiment Station, College of Agriculture, University of Illinois at Urbana-Champaign, 1990 |
| URL | http://books.google.com.hk/books?id=ZHuPMlZ4zT8C&hl=&source=gbs_api |