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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 +
   G03.850.460 Environmental Pollution D004787 +
    G03.850.460.710 Waste Products D014866 +
     G03.850.460.710.600 Sewage D012722 


 G03 Environment and Public Health D004778 +
  G03.850 Public Health D011634 +
   G03.850.860 Sanitation D012499 +
    G03.850.860.510 Sanitary Engineering D012498 +
     G03.850.860.510.900 Waste Management D018505 +
      G03.850.860.510.900.700 Sewage D012722 
        G03.850.860.510.900.700.900 Waste Disposal, Fluid D014865