Use the Wayback Machine, part of the Internet Archive, to save copies of webpages that might change or be removed from their sites. You can also use it to find previously saved copies of webpages.
Web Searching Tips
When using Google to search for official information or statistics on policy topics, limit your search to .gov sites. For example:
The Congressional Research Service prepares reports on topics of public interest or that are the focus of proposed legislation. Access Tips: Also available at Every CRS Report