00535nam a22001697a 4500003000400000005001700004008004100021020001800062082001200080100001900092245006700111250000800178260003500186300001400221365000800235655012200243SNU20130122162012.0130121b        xxu||||| |||| 00| 0 eng d  a9788120338944  a577 RAN  aRana, S. V. S.  aEssentials of Ecology and Environmental SciencecS. V. S. Rana  a4th  aNew DelhibPHI Learning c2010  axv; 568p.  f295  bEcologyb, Ecology and Environmental Scienceb, Definitions, Scope and History of Ecologyb And Ecology and Evolution