000			00314nam a2200121 4500
245			_aProduction, polution, protection _cW.B. Yapp
100			_aYapp, W.B.
260			_aLondon _bWykeham _c1972
300			_axii,183p.:ill.;22cm.
490			_aThe Wykeham Science series; 19
082			_a574.5 _bYAP
041			_aeng
999			_c31355 _d31355