The Ronald Reagan Presidential Library is the repository of presidential records from the administration of Ronald Reagan, the 40th President of the United States, and the burial place of the President and First Lady, Nancy Reagan. It is the largest of the 13 federally operated presidential libraries, containing millions of documents, photographs, films and tapes. There is a permanent exhibit covering the President's life, as well as memorabilia such as Air Force One, the aircraft personally used by the president, and a section of masonry from the Berlin Wall. In 2007, thousands of artifacts were reported missing, and poor record-keeping as well as a breakdown in security software were blamed.