000 00244nam a2200109Ia 4500
008 220201s9999 xx 000 0 eng d
100 _aSHARMA (PD)
245 0 _aECOLOGY & ENVIRONMENT
250 _a17TH
260 _bRASTOGI PUB.
942 _2ddc
999 _c99020
_d99020