| 其他書名 | Performance and Costs, Cost Updated to 1979 and Reaffirmed |
| 出版 | Forest Service, U.S. Department of Agriculture, Northeastern Forest Experiment Station, 1979 |
| URL | http://books.google.com.hk/books?id=zxT3Y-vPWYYC&hl=&source=gbs_api |
| EBook | FULL_PUBLIC_DOMAIN |