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LAST WEEK I gave myself a nasty shock. I had been spending an afternoon in another town doing some research in the central reference library there. I went on till past seven in the evening, rushing at the end to get through all I wanted, then dashing to catch my train home. On the train I opened my briefcase; to discover that I'd come away with an envelope of unissued and strictly ‘confined’ material from the library's local collection.