| 其他書名 | Proceedings of a Symposium Held at Northwest Scientific Association Fortieth Annual Meeting, Pullman, Washington, April 14-15, 1967 |
| 出版 | Pacific Northwest Forest and Range Experiment Station, U.S. Department of Agriculture, 1968 |
| URL | http://books.google.com.hk/books?id=rMFvswEACAAJ&hl=&source=gbs_api |