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Focke, R.: Grundlegung zu einer Theorie des systematischen Kataloges (1900)
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- Beiträge zur Kenntnis des Schrift-, Buch- und Bibliothekswesens
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Molitor, K.: Zu den Vorschlägen betreffend einheitlichen Zetteldruck I (1905)
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- Zentralblatt für Bibliothekswesen. 22(1905), S.129-135
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Berghoeffer, C.W.: Gesamtkatalog und einheitlicher Zetteldruck : I. Zur Organisation des Unternehmens (1906)
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- Zentralblatt für Bibliothekswesen. 23(1906), S.53-61
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Bless, B.: Gesamtkatalog und einheitlicher Zetteldruck : II. Acht Thesen zum Gesamtkatalog (1906)
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- Zentralblatt für Bibliothekswesen. 23(1906), S.61-63
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Kuhnert, E.: Zu Ermans Vorschlag einer einheitlichen Katalogisierung der preußischen Bibliotheken (1904)
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- Zentralblatt für Bibliothekswesen. 21(1904), S.537-544
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Gerhard, K.: Zu Ermans Vorschlag einer einheitlichen Katalogisierung der preußischen Bibliotheken (1904)
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- Zentralblatt für Bibliothekswesen. 21(1904), S.544-550
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Erman, W.: Einheitliche Katalogisierung der preußischen Bibliotheken : ein Vorschlag (1904)
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- Zentralblatt für Bibliothekswesen. 21(1904), S.481-491
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Valentin, G.: ¬Der Katalog (Realkatalog) der Berliner Königlichen Bibliothek (1905)
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- Mitteilungen des Österreichischen Vereins für Bibliothekswesen. 9(1905), S.76-89
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Becker, J.: Informationsstaat und Wissensmarkt : 'IuD' und 'F&E' als Indikatoren (19??)
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Focke, R.: Allgemeine Theorie der Klassifikation und kurzer Entwurf einer Instruktion für den Realkatalog (1905)
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