00298    a2200109   4500020001500000082001800015100001900033245007300052260003100125300002000156650001200176  a8170248817  a577.2703bCHI  aChitkara, M.G.  aEncyclopaedia of ecology,environment and pollutionbthe mother earth  aNew DelhibAPHc1998g1998  axii,381p.c25cm  aEcology