- Ahmed Hebni Helal, Joachim W. Weiss:
The Impact of CD-ROM on Library Operations and Universal Availability of Information. 11th International Essen Symposium, 26-29 September 1988, Festschrift in honor of Maurice B. Line. Veröffentlichungen der Universitäsbibliothek Essen 11, Universitäsbibliothek Essen 1989, ISBN 3-922602-12-6 [contents]
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