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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 +
     D01.268.558.800 Scandium D012538 
     D01.268.558.975 Yttrium D015019 
     D01.268.558.362 Lanthanoid Series Elements D028581 +


 D01 Inorganic Chemicals D007287 +
  D01.552 Metals D008670 +
   D01.552.550 Metals, Rare Earth D008674 +
     D01.552.550.800 Scandium D012538 
     D01.552.550.975 Yttrium D015019 
     D01.552.550.399 Lanthanoid Series Elements D028581 +