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      DDC-Classification
      ddc:000 [1]
      ddc:200 [1]
      ddc:320 [1]
      ddc:370 [1]
      ddc:570 [1]
      ddc:610 [2]
      ddc:630 [2]
      ddc:840 [1]
      ddc:900 [1]
      ddc:930 [1]