000 00349nam a2200157Ia 4500
008 230401s9999 xx 000 0 eng d
020 _a8123710801
041 _aEnglish
044 _aIndia
082 _bSL/I5
100 _aSeshagiri, N
245 0 _aPollution
260 _bNational Book Trust, New Delhi
650 _aScience
942 _2ddc
_cSL
999 _c295
_d295