00331nam a2200145 a 450000500170000008200130001710000180003024500290004826000390007730000230011660000080013963000260014785600060017385600060017920251203114829.0  a577bRAM  aRaman, B.Sd_  aEnvironmental studiesb_  aMangalorebUnited Publishersc2012  a206 p.c24 cm.bPB  bc_  aEnvironmental studies  f_  a_