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TypeAuthor(s)TitleOther TitlesCitationCitation(alt)Issue Date
bulletin (article)菅原, 久雄; 夏目, 俊二; 湊, 克之スギ除伐材を使用した簡易路面排水溝-北海道大学演習林試験年報-Aug-1992
bulletin (article)工藤, 弘; 菅原, 久雄桧山地方演習林の更新技術の現状-北海道大学演習林試験年報-Mar-1991
bulletin (article)菅原, 久雄天塩地方演習林の除間伐作業-北海道大学演習林試験年報-Mar-1986
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