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  • × theme_ss:"Geschichte der Klassifikationssysteme"
  • × year_i:[1950 TO 1960}
  1. Langfeldt, J.: Zum Problem und zur Geschichte der Systematik : T.1-2. (1957) 0.01 
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  2. Hulme, E.W.: Principles of book classification (1950) 0.01 
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