> Verlagsreihe
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Essen:
Future of online catalogues Essen Symposium, 30 Sept. - 3 Oct. 1985 Contributors: Kate Bivins Noerr ... Ed. by Ahmed H. Helal, Joachim W. Weiss
Essen: Gesamthochschulbibliothek, 1986
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Essen:
New trends in electronic publishing and electronic libraries Essen Symposium, 29 August - 31 August 1983 ed. by Ahmed H. Helal
Essen: Gesamthochschulbibliothek, 1984
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Essen:
Local library systems Festschrift in honour of Frederick G. Kilgour to his 70. birthday Essen Symposium 24 Sept. - 27 Sept. 1984. Gesamthochschulbibliothek Essen. Ed. by Ahmed H. Helal
Essen: Gesamthochschulbibliothek, 1984
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Essen:
Hierarchical relationships in bibliographic descriptions Library Systems Seminar Essen, 25 March - 27 March 1981 edited by Ahmed H. Helal, Joachim W. Weiss ; contributors: E. Bonness, B. Delbrück, P. Goossens [und 7 andere] ; Gesamthochschulbibliothek Essen
Essen: Gesamthochschulbibliothek, 1982
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Essen:
Future of library networks Essen Symposium, 16 September - 18 September 1981 Gesamthochschulbibliothek Essen. Contrib. C. Bossmeyer ... Ed. by Ahmed H. Helal
Essen: Gesamthochschulbibliothek, 1982
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Essen:
Current trends in serials automation ed. by Ahmed H. Helal
Essen: Gesamthochschulbibliothek, 1981