"Civil engineering." . . "Straßenentwässerung." . . . . "Drænrør." . . "Urban, regional and transport planning." . . . . . "A survey of the condition of 19 km of highway drains"@en . "A survey of the condition of 19 km of highway drains" . . "A survey of the condition of 19km of highway drains"@en . . . . . . . . . . . . . . . . . . . . . .