The Central Intelligence Agency is set to release 2,500 previously top-secret briefings it gave to presidents John F. Kennedy and Lyndon B. Johnson in the 1960s, a private pro-CIA group announced on Wednesday.

“The vast majority of the documents have never been previously released,” an informed official says, although a number of CIA presidential briefings have surfaced in heavily redacted form over the years. Intelligence officials from the Kennedy and Johnson administrations have also discussed their private conversations with the presidents in memoirs and other books.

The reports, customarily provided personally to the president each morning by a senior CIA officer, if not the director himself, will almost certainly show much of what the spy agency was telling Kennedy and Johnson about Vietnam, Cuba, the Soviet Union, China and conflicts in Africa and the Middle East. They may well also include the CIA’s private assessments of world leaders.