000			00388nam a2200145Ia 4500
008			180710s9999 xx 000 0 und d
020			_a162908
082			_a333.7 _bGRA
100			_aGRAVA, Sigurd
245			_aUrban planning aspects of water polllution control
260			_aNew York _bColumbia University press _c1969
300			_a221 p.
650			_aNatural resources
942			_cS
999			_c90505 _d90505