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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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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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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 :