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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 :
-
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 :
-
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 :
-
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 :
-
Impulse fur Bibliotheken : Festschrift fur Bernhard Adams zum 65. Geburtstag / herausgegeben von Ahmed H. Helal.
- 025.00285
- Universitatsbibliothek Essen,
- c1995.
- 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 :
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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 :
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Resource sharing : new technologies as a must for universal availability of information : 16th International Essen Symposium, 18 October-21 October 1993 : Festschrift in honor of Hans-Peter Geh / edited by Ahmed H. Helal, Joachim W. Weiss.
- 021.64 I61217
- International Essen Symposium (16th : 1993)
- Universitatsbibliothek Essen,
- 1994.
- Essen :
-
Future of online catalogues : Essen symposium 30 September - 3 October 1985 / contributors, Kate Bivins Noerr ... [et al.] ; edited by Ahmed H. Helal, Joachim W. Weiss.
- 025.313 F9962
- Gesamthochschulbibliothek Essen,
- 1986.
- Essen :
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New trends in electronic publishing and electronic libraries : Essen Symposium, 29 August-31 August 1983 / contributors, Wolfhart Anders ... [et al.] ; edited by Ahmed H. Helal, Joachim W. Weiss.
- 025.30285
- Gesamthochschulbibliothek Essen,
- 1984.
- Essen :