> Verlagsreihe
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Essen:
Towards a worldwide library a ten year forecast 19th International Essen Symposium, 23 September - 26 September 1996. Ed. by Ahmed H. Helal
Essen: Universitätsbibliothek, 1997
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Essen:
Information superhighway: the role of librarians, information scientists, and intermediaries ; Festschrift in honor of Frederick Wilfrid Lancaster ; 17. International Essen Symposium, 24 October - 27 October 1994 Universitätsbibliothek Essen. Ed. by Ahmed H. Helal
Essen: Universitätsbibliothek, 1995
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Essen:
Impulse für Bibliotheken Festschrift für Bernhard Adams zum 65. Geburtstag hrsg. von Ahmed H. Helal
Essen: Univ.-Bibliothek, 1995
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Essen:
Opportunity 2000 understanding and serving users in an electronic library ; Festschrift in honour of Herbert S. White 15th International Essen Symposium, 12 October - 15 October 1992 to commemorate the 20th anniversary of the Essen University Library. Ed. by Ahmed H. Helal
Essen: Universitätsbibliothek, 1993