| 其他書名 | Workshop Proceedings, June 13-14, 1978, Carbondale, Illinois |
| 出版 | Department of Agriculture, Forest Service, North Central Forest Experiment Station, 1979 |
| URL | http://books.google.com.hk/books?id=TvIL-Zdk_WgC&hl=&source=gbs_api |
| EBook | FULL_PUBLIC_DOMAIN |