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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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Current trends in serials automation : Essen symposium, 6 October 1980 / Mit Beitr. von B. Barnholdt ... [et al.] ; Hrsg. von A.H. Helal, J.W. Weiss.
- 025.343202854
- Gesamthochschulbibliothek Essen,
- 1981.
- Essen :
-
International library cooperation : 10th Anniversary Essen Symposium, 19 October-22 October 1987 : festschrift in honour of Prof. Dr. Gnther Pflug to his 65th birthday / edited by Ahmed H. Helal, Joachim W. Weiss.
- 021.642 E785
- Essen Symposium (10th : 1987)
- Universittsbibliothek Essen,
- 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 :
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Towards a worldwide library : a ten year forecast : 19th International Essen Symposium, 23 September-26 September 1996 / edited by Ahmed H. Helal, Joachim W. Weiss.
- 020 I61217
- International Essen Symposium (19th : 1996).
- Universitatsbibliothek Essen,
- c1997.
- Essen :
-
Information superhighway : the role of librarians, informationscientists, and intermediaries : 17th International Essen Symposium, 24 October - 27 October, 1994 / edited by Ahmed H. Helal, Joachim W. Weiss.
- 021.65 E785
- Universitätsbibliothek Essen,
- c1995.
- Essen :
-
Information technology and library management : 13th International Essen Symposium, 22 October-25 October 1990 / edited by Ahmed H. Helal, Joachim W. Weiss.
- 025.004 I61217
- International Essen Symposium (13th : 1990)
- Univeistätbibliothek Essen,
- c1991.
- Essen :
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Local library systems : Essen symposium, 24 September-27 September 1984 : festschrift in honour of Frederick G. Kilgour to his 70th birthday / edited by Ahmed H. Helal, Joachim W. Weiss.
- 025.30285 L8111
- Gesamthochschulbibliothek Essen,
- c1984.
- Essen :
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Electronic documents and information : from preservation to access : 18th International Essen Symposium, 23 October-26 October 1995 : festschrift in honor of Patricia Battin / edited by Ahmed H. Helal, Joachim W. Weiss.
- 025.174
- International Essen Symposium (18th : 1995)
- Universittsbibliothek Essen,
- 1996.
- Essen :
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Innovation for information : international contributions to librarianship : Festschrift in honour of Dr. Ahmed H. Helal / edited by Joachim W. Weiss.
- 025.00285 I584
- Universitatsbibliothek Essen,
- c1992.
- Essen :