00383naa a2200145 a 450000100080000000500110000800800410001910000160006024500500007626000060012665300110013265300180014365300130016177300630017410191912001-11-13               bl uuuu     u00u1 u    #d1 aSILVA, C.J.  aOperacao oxigeniobBH combate a fumaca preta.  c0  aFumaca  aMeio ambiente  aPoluicao  tAcao ambiental, Vicosagv.2, n.7, p.32-33, ago./set. 1999.