| 其他書名 | Progress Report 2 to the USDI Bureau of Land Management, Salt Lake City, Utah : April, 1980 to June, 1981 |
| 出版 | U.S. Department of Agriculture, Forest Service, Intermountain Forest and Range Experiment, 1980 |
| URL | http://books.google.com.hk/books?id=U-03jwEACAAJ&hl=&source=gbs_api |