All

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 G03 Environment and Public Health D004778 +
  G03.230 Environment D004777 +
   G03.230.132 Energy-Generating Resources D004736 +
    G03.230.132.258 Fossil Fuels D005579 +
     G03.230.132.258.630 Petroleum D010578 +
      G03.230.132.258.630.500 Fuel Oils D005648