00283nam a2200109Ia 450000500170000000800410001708200140005810000170007224500310008926000450012030000080016520260224040759.0260224s9999||||xx |||||||||||||| ||und||  a628.1 TWO  aTwort, A.C.  2aA textbook of water supply  aNew York: Elsevier Publishers Co. c1963  a422