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Kindervater, J.: ¬Der gegenwärtige Stand der Schlagwortkatalogfrage (1930)
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Langfeldt, J.: Über den Schlagwortkatalog der belehrenden Literatur (1930)
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Björkbom, C.: ¬Der Schlagwortkatalog der Königlichen Bibliothek in Stockholm (1932)
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Kaiser, R.: ¬Der Schlagwortkatalog (1937)
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Escher, H.: ¬Der Schlagwortkatalog der Stadtbibliothek Zürich (1890) (1937)
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