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Egel, J.R.: Großartige Chancen für Verlage und Buchhandlungen (1995)
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Egel, J.R.: Runde Sache : CD-ROM-Lexika nach dem Lifting, elektronische Enzyklopädien etablieren sich (1996)
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Egel, J.R.: ¬Die Erde ist eine Scheibe : Was die vier am häufigsten verkauften Enzyklopädien auf CD-ROM bieten (2000)
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