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  1. Langfeldt, J.: Systematik und Index des Realkatalogs der Stadtbücherei Bochum (1949) 10.31 
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  2. Langfeldt, J.: Zum Problem und zur Geschichte der Systematik : T.1-2. (1957) 10.31 
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  3. Langfeldt, J.: Über den Schlagwortkatalog der belehrenden Literatur (1930) 10.31 
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