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If you could fetch the user's history that would be a major privacy issue.
After a little more research, it looks like I had some overly-ambitious views of history.back() and
history.go(). I don't think it can be done...at least that way.
Thinking about it some more, I'd imagine google doesn't want us to know. They want people to use their system. If we knew who was providing us traffic, we could possibly set up more profitable relationships and bypass adwords/adsense completely.