Former Presidents, from left, George H. W. Bush, Ronald Reagan, Jimmy Carter, Gerald Ford and Richard Nixon shown in the courtyard during the dedication of the Ronald Reagan Presidential Library in Simi Valley, Calif., on Nov. 4, 1991. This photo was autographed by each of the heads of state. The five former presidents reportedly made a pact to sign only a limited number of photographs from the photo session in 1991, a deal that could net each up to $1.5 million. (AP Photo/Marcy Nighswander)