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Focke, R.: Classification: the general theory (1904)
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- Source
- Library journal. 29(1904), S.127-132
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Focke, R.: Allgemeine Theorie der Klassifikation und kurzer Entwurf einer Instruktion für den Realkatalog (1905)
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- Pages
- S.4-18
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Focke, R.: Grundlegung zu einer Theorie des systematischen Kataloges (1900)
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- Pages
- S.66-76
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- a