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Wheatley, H.B.: How to make an index (1902)
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Focke, R.: Classification: the general theory (1904)
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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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Flint, R.: Philosophy as scientia scientiarum and a History of classification of the sciences (1904)
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Immroth, J. P.: Library of Congress Classification (19??)
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