000 002740000a22001210004500
245 _aCommunity wastewater collection and disposal
100 _aOkun, D.A.
100 _aPonghis, G.
260 _aGeneva
_bWHO
_c1975
080 _a628.3
_bO4
041 _aEN
942 _cBK
999 _c115812
_d115812