Abstract
Titia van der Werf is member of the editorial staff of SURFnet InfoServices and KB Alexicon, the net worked information services of SURFnet (National Research Network Organisation of the Netherlands) and the Koninklijke Bibliotheek (National Library of the Netherlands), respectively. She can be con tacted at the Koninklijke Bibliotheek, POB 90407, 2509 LK The Hague, Netherlands.
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