| Type |  Book |
| ชื่อเรื่อง | Log and lumber grades as indicators of wood quality in 20- to 100-year-old Douglas-fir trees from thinned and unthinned stands / R. James Barbour and Dean L. Parry |
| ผู้แต่ง | Barbour, R. James |
| พิมพลักษณ์ | Portland, Or. : U.S. Dept. of Agriculture, Forest Service, Pacific Northwest Research Statino, [2001] |
| รูปเล่ม | 22 p. : ill |
| หัวเรื่อง | Douglas fir --Thinning --Northwest, Pacific [] |
| | Douglas fir --Northwest, Pacific --Age [] |
| | Timber --Quality [] |