What was that other book Obama used?

In one of the pictures of Barack Obama's inauguration, Michelle is holding two books. One is the Holy Bible; anyway, that is what was said. What is the other?

BOB REISECK

Waterford

Editor's Note: According to news accounts, the president took the oath of office Jan. 21 using two bibles. The first was the "Lincoln Bible," sworn upon by President Abraham Lincoln when he took office, and the other was the personal traveling bible of the Rev. Martin Luther King Jr. Jan. 20, during the official swearing-in, Obama used Michelle Obama's family bible.