00337    a2200109   4500020001500000082001800015100001900033245011300052260003100165300001900196650001200215  a8170248906  a577.2703bCHI  aChitkara, M.G.  aEncyclopaedia of ecology,environment and pollutionbthe water (prevention and control of pollution) act,1974  aNew DelhibAPHc1998g1998  axv,343p.c25cm  aEcology