The Miller Center is a foundation of the University of Virginia. This site has pictures, fast facts and quotes about each president.
This site claims to have the most comprehensive information about the POTUS and the presidency. It also has "presidential topics" that can be searched. Be careful as this one may take you to some sites that are not vetted.
Hosted by Drexel University this site, in addition to biographical presidential information, provides information on notable events and cabinet members.
This site which provides information about the First Ladies is sponsored by the US government. A lot of information can be learned about a president if you take time to learn about his family.
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