I don't know if anybody remembers this any more, but back in the mid-to-late1990s there was actually a debate about the relative utility of web directories and web search engines. Yahoo, for example, offered a human-edited directory that separated the web's contents into categories and sub-categories, much like the systems used to categorize books in a library. Early web search engines tended to be less useful because they could easily be tricked. It wasn't until search engines became much more sophisticated that web directories began seeming unnecessarily limited in scope. This is Google's claim to fame. Web search is now so sophisticated and so dominant that the very idea of revisiting the directory concept seems perverse. Yet, a human-edited directory is what may be required to transform Google Books into an actual usable online library. As an example, let's take philosopher John Stuart Mill's 1843 book A System of Logic , which was a highly influential book in the 19th century but isn't
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