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Rovelstad, M.V.: Open access to book collections : theory and practice in America (1985)
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Pflug, G.: Classification in the libraries of the German Federal Republic (1982)
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Hyman, R.J.: Access to library collections : summary of a documentary and opinion survey on the direct shelf approach and browsing (1971)
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Ratcliffe, F.W.: Problems of open access in large academic libraries (1968)
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Jager, K. de: Obsolescence and stress : a study of the use of books on open shelves at a university library (1994)
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Lorenz, B.: ¬The Regensburg Classification Scheme : users and partners (1995)
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Haykin, D.J.: Book classification and the problem of change (1955)
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Holley, R.P.: Classification in the USA (1986)
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Clarke, R.I.: Library classification systems in the U.S. : basic ideas and examples (2021)
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