000			00324nam a2200133Ia 4500
100			_aWalker, Colin
020			_a0 09 123891 9
250			_a2nd rev ed
942			_cBK
245			_aEnvironmental pollution by chemicals
260			_aHutchinson & co.(publishers) Ltd, London _c1975
082			_a614.71 Wal
300			_a72p
999			_c20813 _d20813