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The Wayback Machine
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This blog post is over 23 years old. It's possible that the information you read below isn't current and the links no longer work.
25 Oct 2001
The Internet Archive Wayback Machine has copies of over 10 billion web pages in it’s archived database. If you want to know what a page looked like in the past, just give them the URL and a list of all of the different versions of the page will be displayed.