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Herrick, M.D.: ¬The development of a classified catalog in library schools (1953)
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Barnholdt, B.: ¬A computer-based system for production of a UDC-classed libray catalog at the Technological University Library of Denmark (1968)
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Anker, J.: Some principles of a systematically arranged subject catalogue with an index (1956)
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¬Der Alte Realkatalog der Staatsbibliothek ist online (2006)
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