Secret testimony by former US President Richard Nixon on the Watergate scandal can be made public.
A federal judge has ruled that the testimony's historical significance far outweighs arguments for continued secrecy.
Judge Royce Lamberth has granted a request by historian Stanley Kutler to release the transcript.
But the BBC reports it will not be unsealed until the government has had a chance to appeal.
The Watergate scandal prompted Mr Nixon to resign in 1974.
He left office amid the fallout after a break-in at the Democratic National Committee headquarters at the Watergate complex in Washington.
Mr Nixon testified for two days in California in June 1975, 10 months after his resignation.
He died on 22 April, 1994.