環境과 조화한 砂防事業(I) - 일본의 環境保全砂防 -
Research on Environmentally-Sound Erosion Control Works(I) - Environment-oriented erosion control works in Japan - 환경과 조화한 사방사업(I) - 일본의 환경보전사방 -
environmentally-sound erosion control workscomfortable reiver environmenterosion control damwater channel works and revetmentsfish routeswater quality conservation works