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  • × year_i:[1950 TO 1960}
  • × theme_ss:"Geschichte der Klassifikationssysteme"
  1. Vickery, B.C.: ¬The significance of John Wilkins in the history of bibliographical classification (1953) 0.02 
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  2. Hulme, E.W.: Principles of book classification (1950) 0.01 
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