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author_ss:"Focke, R."
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theme_ss:"Geschichte der Kataloge"
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theme_ss:"Geschichte der Klassifikationssysteme"
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type_ss:"a"
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Focke, R.: Allgemeine Theorie der Klassifikation und kurzer Entwurf einer Instruktion für den Realkatalog (1905)
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Focke, R.: Grundlegung zu einer Theorie des systematischen Kataloges (1900)
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