000 00282nam a2200121Ia 4500
008 220201s1984 xx 000 0 eng d
100 _aDuggal,KN
245 0 _aElements of public health engineering
250 _a3rd
260 _bS,chand&co.
_c1984
300 _a412
942 _2ddc
999 _c83184
_d83184