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Focke, R.: Classification: the general theory (1904)
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- Library journal. 29(1904), S.127-132
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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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Immroth, J. P.: Library of Congress Classification (19??)
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- Encyclopedia of library and information science. Vol.15
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Pobukovsky, M.: Unesco-cooperative development and promotion of the CDS/ISIS system (19??)
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- Encyclopedia of library and information science. Vol.41, [=Suppl.6]