000 00284nam a2200121Ia 4500
008 211209s1977 xx 000 0 und d
041 _aeng
082 _a628 BHA N77 BAR/GUP
100 _aBARATH SINGH
245 _aELEMENTS OF SANITARY ENGINEERING
260 _c1977
300 _a234
999 _c15049
_d15049