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Mills, J.: Chain indexing and the classified catalogue (1955)
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Farradane, J.E.L.: ¬A scientific theory of classification and indexing : further considerations (1952)
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Anker, J.: Some principles of a systematically arranged subject catalogue with an index (1956)
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Mills, J.: Classification of a subject field (1957)
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Farradane, J.: Classification and mechanical selection (1957)
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Fock, J.: 'Katalog der Wissenschaften' und 'Katalog der Sachen' (1959)
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Jackson, I.H.: Advantages and disadvantages of a Subject System of Classification as a key to a depository collection (1951)
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