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A Rogalyuk P S Tschipanov E A Pozdeev
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Abstr aerial logging Aerocrane Alberta ANON ANON ANON average balloon logging balloons and helicopters birds board foot branch OFNC British Columbia Brunswick cable Canada Canadian Forestry Service Club Trans cost cubic feet cubic foot Fletcher Flora Ottawaensis flying height Gatineau Park Goodyear Aerospace growing period Harrington harvesting helicopter logging inches inside bark Labrador Lands length lifting capacity LIVING LIVING LIVING load Log Rule logging operations logging systems machines Macoun Manitoba measurement Newfoundland Northwest Territories Nova Scotia Ontario Oregon Ottawa district Ottawa Field-Nat Ottawa Field-Naturalists Ottawa Nat payload Prince Edward Island Province or Territory pulpwood Quebec regulations sample plot Saskatchewan Section Sikorsky Sikorsky S-64 skidder spruce stand subtype Table timber Trail and Landscape transport tree species TsNIIME U.S. Forest Service Univ USSR volume VTCF wood yarder yarding Yukon Territory