| 其他書名 | A Study of Agricultural Sites in the C&O Canal National Historical Park |
| 出版 | U.S. Department of Interior, National Park Service, Chesapeake & Ohio Canal National Historical Park, 2007 |
| URL | http://books.google.com.hk/books?id=ZmBEbeE295sC&hl=&source=gbs_api |
| EBook | FULL_PUBLIC_DOMAIN |