At most libraries, the hand-typed card catalogues thumbed by generations of patrons have been supplanted by electronic indexes accessed via PCs locally or over the Web. Now that Google has agreed to scan millions of books from five major libraries and to make their contents searchable on the Web -- a project that experts say is likely to yield spinoff technologies that drastically lower the costs of digitization and catalyze similar efforts worldwide -- can the disappearance of libraries themselves be far behind?

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