000 00400 a2200157 4500
020 _a8121908590
082 _a570
_bVER
090 _c20142
_d31240
100 _aVerma, P. S.
245 _aEnvironmental biology
_bprinciples of ecology
260 _aNew Delhi
_bS.Chand & Company Ltd
_c1983
_g1989
300 _aviii,591p.
_c21cm
650 _aLife sciences
700 _aAgarwal, V. K.
942 _cL
999 _c47799
_d47799