Elahera-Minneriya Yodi Ela engineering surveys, C.P. and N.C.P. headworks area(Elahera-Minneriya Yodi Ela head work area key diagram engineering contour surveys Giritale bridge)
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Elahera-Minneriya Yodi Ela engineering surveys, C.P. and N.C.P. headworks area(Elahera-Minneriya Yodi Ela head work area key diagram engineering contour surveys Giritale bridge)