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  1. ¬The impact of CD-ROM on library operations and universal availability of information : 11th International Symposium Essen, 1988. Festschrift in honour of Maurice B. Line (1989) 10.60 
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    Editor
    Helal, A.H. u. J. Weiss
  2. Libraries and electronic publishing : promises and challenges for the 90's. 14th Int. Essen Symp. 14.-17.10.1991. Festschrift in honour of Richard M. Dougherty (1992) 10.60 
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    Helal, A.H. u. J. Weiss

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