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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 +
   G03.230.560 Seasons D012621 


 H01 Natural Sciences D010811 +
  H01.862 Time D013995 +
   H01.862.645 Periodicity D010507 +
    H01.862.645.661 Seasons D012621