00561nam a22001937a 450000500170000001000140001702000100003103500130004103700130005408200130006724500470008026000690012727000520019630000220024865000270027065000300029770000210032770000190034820100811141159.0  aENG-99711  c40.00  aEN-83243  bDBAD/PUB  a333.7097  aEnvironmental studies :bU.G.C. syllabus /  aTiruchirappallibPeriyar E.V.R. College Alumni Associationc2007  aPeriyar E.V.R. CollegebTiruchirappallie620023  a214p.c21cm (pbk)  aEnvironment protection  aEnvironmental Engineering  aSharma, C Monika  aNayak, Shankar