000 00295nam a2200109Ia 4500
008 220201s1996 xx 000 0 eng d
100 _aIS 9620 1980
245 0 _aGUIDE FOR UNITS USED IN AIR QUALITY MEASUREMENTS
260 _aDELHI
_bBUREAU OF INDIAN STANDARD
_c1996
300 _a6
942 _2ddc
999 _c91902
_d91902