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System des Real-Katalogs der Universitätsbibliothek Heidelberg (1885)
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- Geschichte der Klassifikationssysteme
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Schleiermacher, A.A.E.: Bibliographisches System der gesamten Wissenschaftskunde : mit einer Anleitung zum Ordnen von Bibliotheken (1847)
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Hartwig, O.: Schema des Realkatalogs der königlichen Universitätsbibliothek zu Halle a.d. Saale (1888)
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