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Classifying Pre-20th Century Works

• At NLM, works published prior to 1914 are classed either in the WZ schedule or in the 19th Century Scheduleli>

• The rules for classifying pre-20th century works also apply to reprints and facsimiles of these works
  
  • These rules do not apply to new editions of early printed works which are classed in the main schedules by topic