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Focke, R.: Allgemeine Theorie der Klassifikation und kurzer Entwurf einer Instruktion für den Realkatalog (1905) 0.05

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Source: Festschrift zur Begrüßung der 6. Versammlung Deutscher Bibliothekare in Posen

Focke, R.: Grundlegung zu einer Theorie des systematischen Kataloges (1900) 0.01

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Source: Beiträge zur Kenntnis des Schrift-, Buch- und Bibliothekswesens

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