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  1. Focke, R.: Allgemeine Theorie der Klassifikation und kurzer Entwurf einer Instruktion für den Realkatalog (1905) 10.31 
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  2. Focke, R.: Classification: the general theory (1904) 10.31 
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  3. Focke, R.: Grundlegung zu einer Theorie des systematischen Kataloges (1900) 10.31 
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