00450naa a2200181 a 450000100080000000500110000800800410001910000140006024500580007426000090013265000170014165000130015865000170017165300130018865300130020165300130021477300410022717966041999-05-31       1981    bl ---       0--  u    #d1 aLLOYD, S.  aProgress in immunization against parasitic helminths.  c1981  aimmunization  aHelminto  aImunização  aHelminth  aParasita  aParasite  tParasitologygv.83, p.225-242, 1981.