In the 1970s, long before the Internet, there were mainly four ways of finding information on a subject. Three of these were books, magazines and newspapers. The fourth was newsletters. The problem was simple enough, once a book was published it was immediately out of date. New information would be published at irregular intervals in magazines and newspapers but the problem was finding out when and where such items were put on the newsstand. Some got round this by subscribing to newspaper clipping services but others subscribed to newsletters.
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