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Bliss, H.E.: ¬The organization of knowledge in libraries and the subject-approach to books (1939)
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Haigh, F.: ¬The subject classification of fiction : an actual experiment (1933)
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Brown, J.D.; Stewart, J.D.: Subject classification (1939)
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Ranganathan, S.R.: Colon Classification : Pt.1: Rules of classification; Pt.2: Schedules of classification; Pt.3: Index to the schedules (1933)
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Ansteinsson, J.: Dilemmas of classification (1934)
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Corbett, E.V.: ¬The classification of fiction (1938)
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Burgess, L.A.: ¬A system for the classification and evaluation of fiction (1936)
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Ansteinsson, J.: ¬The subject catalog in Germanic countries (1933)
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