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Langfeldt, J.: Systematik und Index des Realkatalogs der Stadtbücherei Bochum (1949)
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Klassifikation der Stadtbücherei Bochum (1975 ff)
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Richtlinien für die Sacherschließung der Stadtbücherei Bochum (1987 ff)
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Systematik der Kölner Stadtbücherei (1955 ff)
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Systematik der Stadtbücherei Frankfurt (1974)
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