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© May 2005 Lorentz JÄNTSCHI && Sorana Daniela BOLBOACĂ

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 G03 Environment and Public Health D004778 +
  G03.230 Environment D004777 +
   G03.230.132 Energy-Generating Resources D004736 +
     G03.230.132.200 Electricity D004560 
     G03.230.132.258 Fossil Fuels D005579 +
     G03.230.132.580 Nuclear Energy D009678 +
     G03.230.132.708 Solar Energy D012993