| 其他書名 | An Example from a Ponderosa Pine Forest in the Southwest |
| 出版 | Rocky Mountain Forest and Range Experiment Station, Forest Service, U.S. Department of Agriculture, 1982 |
| URL | http://books.google.com.hk/books?id=5UAh40XN-U4C&hl=&source=gbs_api |
| EBook | FULL_PUBLIC_DOMAIN |