Departement Publieke WerkenPublieke Werke Dept.Wierda, Sytze Wopkes, 1839-19112014-08-262014-08-261899-06-012014-08-26http://hdl.handle.net/2263/41696Digitised version of National Archive file S.2/177. Sketch of a reservoirSketchPDF, JPEGNational Archives; Digital rights: University of PretoriaReservoirPlan or blueprint