The final instalment of the tapes recorded in the White House by former President Richard Nixon has been released by the US National Archives and Records Administration.
They were recorded over three months in 1973 and covered the culmination of the Watergate scandal that led to Mr Nixon's resignation.
The recordings also include the day three senior White House officials resigned over the affair and another was sacked.
Another 700 hours of recordings remain restricted by national security and privacy concerns, but the archive has said they will now be reviewed to see what can be released.
Mr Nixon remains the only US President to resign.
The recordings cover the period from 9 April to 12 July 1973 – the day before the existence of the covert recording system was revealed to a Senate committee.
Conversations between Mr Nixon and Henry Kissinger, three future superstars and Brazilian football legend Pele are included in the release.