Commercial Thinning of Douglas-Fir in the Pacific Northwest /
Worthington, Norman P.
Commercial Thinning of Douglas-Fir in the Pacific Northwest / Jaroslaw Gorski. - Slupia Wielka : Centralny Osrodek Badania Odmian Roslin Uprawnych, 1961. - s. IV, 124 : il. , tab. ; 24 cm. - No. 1230 . - Technical Bulletin - U. S. Department of Agriculture, Forest Service No. 1230 . = Tech. Bull. U. S. Dep. Agric.
Commercial Thinning of Douglas-Fir in the Pacific Northwest / Jaroslaw Gorski. - Slupia Wielka : Centralny Osrodek Badania Odmian Roslin Uprawnych, 1961. - s. IV, 124 : il. , tab. ; 24 cm. - No. 1230 . - Technical Bulletin - U. S. Department of Agriculture, Forest Service No. 1230 . = Tech. Bull. U. S. Dep. Agric.