| 其他書名 | Locations of Airport and Airway System Costs |
| 出版 | Department of Transportation, Office of the Assistant Secretary for Policy and International Affairs, Office of Policy Review, 1972 |
| URL | http://books.google.com.hk/books?id=bwk6AQAAMAAJ&hl=&source=gbs_api |
| EBook | FULL_PUBLIC_DOMAIN |