| 其他書名 | Eagle Cap Wilderness, Bob Marshall Wilderness, and Grand Canyon National Park. 1991-1992 |
| 出版 | U.S. Department of Agriculture, Forest Service, Intermountain Research Station, 1991 |
| URL | http://books.google.com.hk/books?id=l1Iwm9sRXyYC&hl=&source=gbs_api |
| EBook | FULL_PUBLIC_DOMAIN |