| 其他書名 | A Research Work Unit of the Intermountain Research Station, Forest Service, U.S. Department of Agriculture |
| 出版 | U.S. Department of Agriculture, Forest Service, Intermountain Research Station, 1985 |
| URL | http://books.google.com.hk/books?id=6sfHuQEACAAJ&hl=&source=gbs_api |