| 其他書名 | A Selected List of References Relating to the Various Phases of Railway, Motor, and Water Carrier Transportation |
| 出版 | U.S. Department of Agriculture, Bureau of Agricultural Economics, 1939 |
| URL | http://books.google.com.hk/books?id=Iex7Ja-2Wx4C&hl=&source=gbs_api |