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      DDC-Classification
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      ddc:320 [174]
      ddc:330 [361]
      ddc:333.7 [30]
      ddc:340 [140]
      ddc:350 [7]
      ddc:360 [71]
      ddc:370 [343]
      ddc:380 [21]
      ddc:390 [3]
      ddc:400 [105]
      ddc:420 [32]
      ddc:430 [111]
      ddc:439 [3]
      ddc:440 [16]
      ddc:450 [1]
      ddc:460 [7]
      ddc:470 [4]
      ddc:480 [14]
      ddc:490 [14]