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Libraries and electronic publishing : promises and challenges for the 90's : 14th Annual Essen Symposium, 14 October-17 October 1991 : festschrift in honour of Richard M. Dougherty / edited by Ahmed H. Helal, Joachim W. Weiss.
- 070.594 I61217
- International Essen Symposium (14th : 1991)
- Universittsbibliothek Essen,
- c1992.
- Essen :
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Developments in microcomputing : discovering new opportunities for libraries in the 1990s : 12th International Essen Symposium, 23 October-26 October 1989 : festschrift in honour of Richard De Gennaro / edited by Ahmed H. Helal, Joachim W. Weiss.
- 025.30285416 I61217
- International Essen Symposium (12th : 1989)
- Universitatsbibliothek Essen,
- 1990.
- Essen :