Abstract
Shared authority files and co-operation in the development of national lists, both author and subject, have enabled libraries to share resources and improve access to their collections. As we move from national resource sharing to a more international approach (for example with the TEL (The European Library) project (http:// www.europeanlibrary.org)) the difficulties of searching across collections have been underlined. Variations in author and corporate author headings across languages and subject headings in different languages have meant that frequently the search option of choice has been keyword. This brings results but its limitations are well—known.
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