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© May 2005 Lorentz JÄNTSCHI && Sorana Daniela BOLBOACĂ

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 G03 Environment and Public Health D004778 +
  G03.850 Public Health D011634 +
   G03.850.860 Sanitation D012499 +
    G03.850.860.510 Sanitary Engineering D012498 +
     G03.850.860.510.915 Water Supply D014881 +
       G03.850.860.510.915.300 Fluoridation D005457 
       G03.850.860.510.915.900 Water Purification D018508