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© May 2005 Lorentz JÄNTSCHI && Sorana Daniela BOLBOACĂ

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 D01 Inorganic Chemicals D007287 +
  D01.268 Elements D004602 +
   D01.268.558 Metals, Rare Earth D008674 +
    D01.268.558.975 Yttrium D015019 


 D01 Inorganic Chemicals D007287 +
  D01.268 Elements D004602 +
   D01.268.956 Transition Elements D028561 +
    D01.268.956.890 Yttrium D015019 


 D01 Inorganic Chemicals D007287 +
  D01.552 Metals D008670 +
   D01.552.550 Metals, Rare Earth D008674 +
    D01.552.550.975 Yttrium D015019