00402nam a2200145 a 450000500170000000800410001702000150005804100080007308200080008110000170008924500650010626400500017130000160022170000190023720260717100956.0260717s2008    ii            000 0 eng d  a8121908590  aeng04a5771 aVerma, P. S.10aEnvironmental Biology : Principles of Ecology /cVerma, P.S. 1aNew Delhi :bS. Chand & Company Ltd.,cc2008.  avii, 591 p.1 aAgarwal, V. K.