Wästerlund, Iwan Forest Harvesting Systems Friendly to the Environment. Uppsatser och Resultat nr 277 / Iwan Wästerlund, Awatif E. Hassan. -- 1.vyd. -- Garpenberg : The Swedish University of Agricultural Sciences, Department of Operational Efficiency, 1995. -- 30 s.: 8 obr., 1 tab.

I. Hassan, Awatif E.
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