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Vogeler, F.; Walther, A.: Theoretisches und Praktisches über die Anlage des Schlagwortkataloges in Volksbüchereien (1931)
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Otlet, P.: Traité de documentation : le livre sur le livre - théorie et pratique (1934)
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Vorstius, J.: ¬Die Katalogprobleme im Spiegel der ausländischen Fachliteratur seit 1930 (1933)
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Wyer, J.A.: Reference work (1930)
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Wells, H.G.: World brain (1938)
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Bliss, H.E.: ¬The organization of knowledge in libraries and the subject-approach to books (1939)
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Brown, J.D.; Stewart, J.D.: Subject classification (1939)
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Ranganathan, S.R.: Colon Classification : Pt.1: Rules of classification; Pt.2: Schedules of classification; Pt.3: Index to the schedules (1933)
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