| 其他書名 | A Discovery Book for Interpreters |
| 出版 | National Park Service, Cooperative Park Studies Unit, College of Forest Resources, University of Washington, 1978 |
| URL | http://books.google.com.hk/books?id=u1B190b817QC&hl=&source=gbs_api |
| EBook | FULL_PUBLIC_DOMAIN |