00401nam a2200169Ia 4500003000400000005001700004008004100021020001900062040000700081041000800088082001500096100001400111245004000125260003800165300000900203650001900212OSt20250820095451.0250729s2005    xx            000 0 und d  a 9788176489102  cAL  aeng  a372.8 SINT  aSingh U K  aTeachning of enviournmental science  aNew DelhibA P H Publishingc2005  a366p  aEnviournmental