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Local library systems : Festschrift in honour of Frederick G. Kilgour to his 70. birthday
Helal, Ahmed H. (contributor);  … - 1984
Persistent link: https://www.econbiz.de/10000121266
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Impulse für Bibliotheken : Festschrift für Bernhard Adams zum 65. Geburtstag
Helal, Ahmed H. (contributor); Adams, Bernhard (honouree);  … - 1995
Persistent link: https://www.econbiz.de/10000552355
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Future of library networks : Essen Symposium, 16 September - 18 September 1981
Helal, Ahmed Helmi (ed.); Boßmeyer, Christine (contributor) - 1982
Persistent link: https://www.econbiz.de/10000011349
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Current trends in serials automation
Helal, Ahmed H.; Wolf, D.; Jeffreys, A. E. - 1981
Persistent link: https://www.econbiz.de/10011284160
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Probleme des Verbundsystems in Nordrhein-Westfalen aus der Sicht der Gesamthochschulbibliothek Essen
Helal, Ahmed Helmi - In: Die Zukunft automatisierter Bibliotheksnetze in der …, (pp. 68-111). 1977
Persistent link: https://www.econbiz.de/10003575416
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New trends in electronic publishing and electronic libraries : Essen Symposium, 29 August - 31 August 1983
Helal, Ahmed Helmi (ed.); Weiss, Joachim W. (contributor) - 1984
Persistent link: https://www.econbiz.de/10014003455