| 其他書名 | Description of study and existing study areas |
| 出版 | Pacific Northwest Forest and Range Experiment Station, Forest Service, U.S. Department of Agriculture, 1971 |
| URL | http://books.google.com.hk/books?id=TDgkr9S2UqYC&hl=&source=gbs_api |
| EBook | FULL_PUBLIC_DOMAIN |