| 其他書名 | A Comparison of Three Indirect Methods for Estimating Benefits |
| 出版 | U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station, 1988 |
| URL | http://books.google.com.hk/books?id=8oRGAQAAIAAJ&hl=&source=gbs_api |
| EBook | FULL_PUBLIC_DOMAIN |