About OKAMOTO TOSHIRO
About 地盤工学会誌
About river levee
About fill dam
About fracture
About slope stability
About adhesive force
About structure(construction)
About earth structure
About leaching
About technical standard
About seepage failure
About soil structure
About River construction work
About Dams in general
About 河川堤防
About フィルダム
About 浸透破壊
About 評価法