The Chicago Public Library has redesigned their website. The result is that none of the links to previous CPL information pages work. I will make every effort to either correct the link or remove it. Most of the Chicago history links on CPL seem to either bring up a list of books or an article from the Encyclopedia of Chicago. I haven't investigated the entire new site, but my initial evaluation is not particularly positive. Would an archive be too much to ask? Check it out for yourself.
UPDATE: I've gone through the site and removed the broken CPL links. I did, however, correct the link in the sidebar to their Chicago history timeline.