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  • × theme_ss:"Geschichte der Klassifikationssysteme"
  • × year_i:[1900 TO 1910}
  1. Focke, R.: Allgemeine Theorie der Klassifikation und kurzer Entwurf einer Instruktion für den Realkatalog (1905) 0.00 
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  2. Focke, R.: Grundlegung zu einer Theorie des systematischen Kataloges (1900) 0.00 
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