00311nam a2200121Ia 4500003000400000008004100004020001500045040000800060100001500068245006100083260003000144300001500174LDD181029s9999    xx            000 0 und d  a818509716x  cLDD  aSinha, A.K 0aWater pollution (Conservation and management)cA.K Sinha  aNainitalbGyanodayac1989  aviii, 378p