00473nam a22001697a 450000500170000001000150001702000110003203500140004303700430005703700090010008200100010924500160011925000150013526000390015027000890018930000250027820250306120517.0  aENG-143963  c500.00  aEN-127495  bShankar IAS  academy book publications  bDBAD  a363.7  aEnvironment  a9h rev. ed  aChennaibShankar IAS Academyc2021  aPlot no. 1742, Ist Floor, 18th Main Road, Anna NagarbChennaie600040k9962002006(M)  alvi, 448p.c24cm(pb)