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      DDC-Classification
      ddc:000 [1362]
      ddc:004 [76]
      ddc:010 [13]
      ddc:020 [54]
      ddc:050 [2]
      ddc:060 [1]
      ddc:070 [13]
      ddc:090 [8]
      ddc:100 [137]
      ddc:150 [92]
      ddc:200 [15]
      ddc:220 [2]
      ddc:230 [19]
      ddc:290 [3]
      ddc:300 [214]
      ddc:320 [78]
      ddc:330 [259]
      ddc:333.7 [16]
      ddc:340 [66]
      ddc:350 [3]