| 其他書名 | An Investigation of Visitor Knowledge and Beliefs |
| 出版 | Intermountain Forest & Range Experiment Station, Forest Service, U.S. Department of Agriculture, 1976 |
| URL | http://books.google.com.hk/books?id=xIEFDQK-cbgC&hl=&source=gbs_api |
| EBook | FULL_PUBLIC_DOMAIN |