00306nam a2200109Ia 450000500170000000800410001708200150005810000160007324500610008926000380015030000080018820260224041001.0260224s9999||||xx |||||||||||||| ||und||  a333.91 CEC  aCech, T.V.  0aPrinciples of water resources: history, development, …  aNew York: John Wiley & Sonsc2003  a468