00290nam a2200109Ia 450000500170000000800410001708200160005810000150007424500420008926000410013130000080017220260224040907.0260224s9999||||xx |||||||||||||| ||und||  a363.728 GOP  aGopal, K.  0aFundamentals of water and waste water  aNew Delhi: A.P.H. Publicationsc2004  a154