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FILE - Former President Jimmy Carter holds a copy of his book, "An Outdoor Journal: Adventures and Reflections," in May 1988 in Georgia. (AP Photo/Joe Holloway Jr., File)

FILE - Former President Jimmy Carter holds a copy of his book, "An Outdoor Journal: Adventures and Reflections," in May 1988 in Georgia. (AP Photo/Joe Holloway Jr., File)

This combination of book cover images shows some of the many books authored by President Jimmy Carter, top row from left, "An Hour Before Daylight: Memories of a Rural Boyhood," "Christmas in Plains: Memories," "The Nobel Peace Prize Lecture," "The Hornet's Nest: A Novel of the Revolutionary War," "Sharing Good Times," "Our Endangered Values: America's Moral Crisis," and "Palestine: Peace Not Apartheid," bottom row from left, "Beyond the White House," "A Remarkable Mother," "We Can Have Peace in the Holy Land: A Plan That Will Work," "White House Diary" (FSG), "A Call to Action: Women, Religion, Violence, and Power," "A Full Life: Reflections at Ninety," and "Faith: A Journey for All." (Simon & Schuster/FSG via AP)

This combination of book cover images shows some of the many books authored by President Jimmy Carter, top row from left, "An Hour Before Daylight: Memories of a Rural Boyhood," "Christmas in Plains: Memories," "The Nobel Peace Prize Lecture," "The Hornet's Nest: A Novel of the Revolutionary War," "Sharing Good Times," "Our Endangered Values: America's Moral Crisis," and "Palestine: Peace Not Apartheid," bottom row from left, "Beyond the White House," "A Remarkable Mother," "We Can Have Peace in the Holy Land: A Plan That Will Work," "White House Diary" (FSG), "A Call to Action: Women, Religion, Violence, and Power," "A Full Life: Reflections at Ninety," and "Faith: A Journey for All." (Simon & Schuster/FSG via AP)

FILE - Copies of former President Jimmy Carter's book, "A Full Life: Reflections at Ninety," sit in stacks at the Free Library in Philadelphia, July 10, 2015. (AP Photo/Matt Rourke, File)

FILE - Copies of former President Jimmy Carter's book, "A Full Life: Reflections at Ninety," sit in stacks at the Free Library in Philadelphia, July 10, 2015. (AP Photo/Matt Rourke, File)

FILE - Former President Jimmy Carter holds a copy of his book, "Palestine: Peace, Not Apartheid," at a book signing in Tempe, Ariz., Dec. 12, 2006. (AP Photo/Paul Connors, File)

FILE - Former President Jimmy Carter holds a copy of his book, "Palestine: Peace, Not Apartheid," at a book signing in Tempe, Ariz., Dec. 12, 2006. (AP Photo/Paul Connors, File)