“If you can see it, it's obsolete.” This dictum, applied usually to the amazingly rapid progress in aircraft design, has validity also for books. Not only in technical mat‐ters but increasingly in general subjects, by the time a book reaches the reader the march of events has put it out of date. Later information is scattered in pamphlets and periodicals, in newspapers, and sometimes in manuscript. Somehow or other most of this plethora of paper must be captured, classified, and made more readily accessible.
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