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[Edit Description]
This Bookmarklet takes the current page and looks for archived versions of that page in the Internet Archive (http://www.archive.org).This is especially useful for dead links.
Source (toolserver.org)
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javascript%3A%28function%28%29%7B%2520location.href%3D%27http%3A//web.archive.org/web/*/%27+location.href%3B%2520%7D%29%28%29%3B
archive.org dead link older versions of a website
