. . "Ackers." . . "Pipe." . . . . . . "Charts, diagrams, etc"@en . . . . . . . . . . "Charts for the hydraulic design of channels and pipes" . . . . "Charts for the hydraulic design of channels and pipes"@en . . "Tables" . . . . . . . . . . "Charts for the Hydraulic Design of Channels and Pipes"@en .