. . . . "The Cascade low level tunnel An inquiry as to economic feasibility of building a tunnel through the Cascade range in Washington for rail and vehicular traffic as proposed by the late Brigadier General H.F. [sic] Chittenden"@en . . "The Cascade low level tunnel. An inquiry as to economic feasibility of building a tunnel through the Cascade range in Washington for rail and vehicular traffic as proposed by the late Brigadier General H.F. [sic] Chittenden" . . . "Cascade tunnel report" . "Cascade tunnel report"@en . . . . . . . "Cascade Range." . .