has announced that it will publish President Reagans diaries, "the most detailed presidential diaries in Americas history".
HarperCollins said it had signed a deal with the Ronald Reagan Presidential Library Foundation for world rights to publish the diaries.
They will be displayed at the presidential library in Simi Valley, California.
"Each day during his eight years in the White House, Ronald Reagan recorded his innermost thoughts and observations in his personal diary," said Frederick Ryan Jr, Chairman of the Board of Trustees for the Ronald Reagan Presidential Foundation.
"Although they were not initially intended for publication, we feel that these volumes offer an unprecedented insight into the Reagan presidency."