003770000a22001450004500020001500000060000800015082001200023100002100035245002700056250000700083260003300090260000900123300000900132650009000141  a0721621953  a100  a576 BUR  aBurrows, William  aText book microbiology  a20  aLondon, W B Saunders Company  c1973  a1035  aMicrobiology/ bacterial metabolism/ immunity - hypersensiticity/ medical parasitology