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Rider, F.: ¬The story of D.C., 1876-1951 (1951)
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Hilgenberg, O.C.: Zur Entstehung der Dezimalklassifikation (1952)
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Eaton, T.: Classification in college and university libraries (1955)
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Haykin, D.J.: Book classification and the problem of change (1955)
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Graziano, E.E.: Hegel's philosophy as basis for the Dewey classification schedule (1959)
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