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Resource sharing : new technologies as a must for universal availability of information. Festschrift in honor of Hans-Peter Geh. 16th International Essen Symposium, 18.-21.10.1993 (1994)
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Impulse für Bibliotheken : Festschrift für Berhard Adams zum 65. Geburtstag (1995)
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Future of online catalogues : Essen symposium, 30.9.-3.10.1985 (1986)
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