Theodore Roosevelt with 35 Books, though some sources say it was 37, I'll trust my trivial persuit game answer ;-)
Patricia O'Toole, author of When Trumpets Call: Theodore Roosevelt After the White House, says he wrote 38.
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The president is not required to use a book as part of the swearing in ceremony, but most put their hand on a Bible. Pierce used a law book.
The most effective us president is Abhraham Linkhan
Executive office of the president
Abraham Lincoln is the most written about person in history right after Jesus
Jackson