000 00261nam a2200121Ia 4500
041 _aEN
082 _a500
_bKOT
100 _aKotpal, R.L .
245 0 _aConcepts of Ecology / R.L.Kotpal.
260 _bPunjab : Vishal ,
_c1989
300 _a264
942 _cBK
999 _c21260
_d21260