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2. Bergstrand, K.G., 1991. Planning and analysis of forestry operation studies. Skogsarbeten Bulletin n. 17, 63 pp.
3. Residual stand damage from cut-to-length thinning of second growth timber in the Cascade Range of western Oregon;Bettinger;For. Prod. J.,1993
4. IUFRO Forest Work Study Nomenclature;Björheden,1995
5. Logging Practices: Principles of Timber Harvesting Systems;Conway,1982