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Bärmann, U.: CD-ROM retro 1972-1985 (DNB-CD retro 2) (1999) 0.01

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Bärmann, U.: Neues von der Deutschen Nationalbibliographie auf CD-ROM (1996) 0.01

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Bärmann, U.: Neue CD-ROM Der Deutschen Bibliothek : DNB-CD retro (1995) 0.01

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