By the numbers: Presidential libraries

POSTED: 12:15 PM PDT April 25, 2013    UPDATED: 9:24 AM PDT April 25, 2013 
George W

Former president George W. Bush was joined by every living president for the dedication of the George W. Bush Presidential Center in Dallas today. Take a look at images of the center as well as a by-the-numbers look at other presidential libraries.