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Kropp, H.: DFÜ: sämtliche Einsatzmöglichkeiten der Fernsprech- und Datexdienste : aktuelles Nachschlagewerk mit Musterlösungen für die rationelle Nutzung der Postdienste und Erfahrungsberichte aus der Praxis (1988)
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Handbuch der Telekommunikation (1994-)
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Rentrop, N.; Sackmann, H.-J.: ¬Der Telekommunikations-Berater (1993)
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