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1990 – 1999
- 1997
[e12]Ahmed Hebni Helal, Joachim W. Weiss:
Towards a Worldwide Library: A ten Year Forecast. 19th International Essen Symposium, 23-26 September 1996, Essen, Germany. Veröffentlichungen der Universitäsbibliothek Essen 21, Universitäsbibliothek Essen 1997, ISBN 3-922602-22-3 [contents]- 1996
- [e11]Ahmed Hebni Helal, Joachim W. Weiss:
Electronic Domuments and Information: From Preservation to Access. 18th International Essen Symposium, 23-26 October 1995, Essen, Germany. Festschrift in honor of Patricia Battin. Veröffentlichungen der Universitäsbibliothek Essen 20, Universitäsbibliothek Essen 1996, ISBN 3-922602-21-5 [contents] - 1995
- [e10]Ahmed Hebni Helal, Joachim W. Weiss:
Information Superhighway: The Role of Librarians, Information Scientists, and Intermediaries. 17th International Essen Symposium, 24-27 October 1994, Festschrift in honor of F. W. Lancaster. Veröffentlichungen der Universitäsbibliothek Essen 18, Universitäsbibliothek Essen 1995, ISBN 3-922602-19-3 [contents] - 1994
- [e9]Ahmed Hebni Helal, Joachim W. Weiss:
Resource Sharing: New Technologies as a Must for Universal Avaiability of Information. 16th International Essen Symposium, 18-21 October 1993, Festschrift in honor of Hans-Peter Geh. Veröffentlichungen der Universitäsbibliothek Essen 17, Universitäsbibliothek Essen 1994, ISBN 3-922602-18-5 [contents] - 1993
- [e8]Ahmed Hebni Helal, Joachim W. Weiss:
Opportunity 2000: Understanding and Serving Users in an Electronic Library. 15th International Essen Symposium, 12-15 October 1992, Festschrift in honor of Herbert S. White. Veröffentlichungen der Universitäsbibliothek Essen 15, Universitäsbibliothek Essen 1993, ISBN 3-922602-17-7 [contents] - 1992
- [e7]Ahmed Hebni Helal, Joachim W. Weiss:
Libraries and Electronic Publishing: Promises and Challenges for the 90's. 14th International Essen Symposium, 14-17 October 1991, Festschrift in honor of Richard M. Dougherty. Veröffentlichungen der Universitäsbibliothek Essen 14, Universitäsbibliothek Essen 1992, ISBN 3-922602-15-0 [contents] - 1991
- [e6]Ahmed Hebni Helal, Joachim W. Weiss:
Information Technology and Library Management. 13th International Essen Symposium, 22-25 October 1990, Festschrift in honor of Margaret Beckman. Veröffentlichungen der Universitäsbibliothek Essen 13, Universitäsbibliothek Essen 1991, ISBN 3-922602-14-2 [contents] - 1990
- [e5]Ahmed Hebni Helal, Joachim W. Weiss:
Developments in Microcomputing: Discovering New Opportunities for Libraries in the 1990s. 12th International Essen Symposium. Veröffentlichungen der Universitäsbibliothek Essen 12, Universitäsbibliothek Essen 1990, ISBN 3-922602-13-4 [contents]
1980 – 1989
- 1989
- [e4]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] - 1987
- [e3]Ahmed Hebni Helal, Joachim W. Weiss:
Impact of New Information Technology on International Library Cooperation. Essen Symposium, 8-11 September 1986. Veröffentlichungen der Universitäsbibliothek Essen 9, Universitäsbibliothek Essen 1987, ISBN 3-922602-10-X [contents] - 1986
- [e2]Ahmed Hebni Helal, Joachim W. Weiss:
Future of Online Catalogues, Essen Symposium, 30 September 1985 - 3 October 1985. Veröffentlichungen der Universitäsbibliothek Essen 8, Universitäsbibliothek Essen 1986, ISBN 3-922602-09-6 [contents] - 1984
- [e1]Ahmed Hebni Helal, Joachim W. Weiss:
Local Library Systems, Essen Symposium, 24-27 September 1984. Veröffentlichungen der Universitäsbibliothek Essen 7, Universitäsbibliothek Essen 1984, ISBN 3-922602-08-8 [contents]
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