The first tapes (40 hours) were released by President Nixon -- sort of -- in 1974. These tapes ( 3,700 hours !! ) were released in 1994. Over his dead body (literally -- he died in 1992). They provide the answers to a couple of the pressing questions from the time of Watergate.
1) why oh WHY didn't Nixon burn the tapes instead of releasing them ?
His attorneys advised that destroying the tapes, after their existence became known, would be considered an obstruction of justice, which is an impeachable offense.
He figured controlling the ( many !! ) revelations of wrongdoing on the tapes could be controlled easier than explaining destruction of the tapes.
He never thought the Supreme Court would actually order the release of the tapes.
He needed to hold on to the tapes to help him write his memoirs, which he did in 1978 -- RN: The memoirs of Richard Nixon ( 1,120 pages !! )
2) why did Judge John Sirica refuse to accept the guilty pleas of the Watergate burglars ? i was shocked at the time. can a judge do that, and, if so, why ? and then, after they were found guilty, he sentenced them -- first offenders all, no weapons, no theft, a simple breaking and entering case -- to 50 years each in prison. why ? as it turns out, the Judge suspected there was greater involvement and he wanted the culprits to tell everything they knew about Watergate and any other illegal government involvement . and he got it. he is the one who actually broke the case wide open, NOT the self-promoting newspaper reporters.
This book is over 600 pages. and every page is a transcription of Nixon talking to someone (usually Haldeman and/or Erlichman) about the Watergate case. it got pretty annoying after a while. i mean, he said the same things over and over and over again. and then he rephrased them and said them yet again.
My fav part is when Nixon stands real close to the hidden microphone and converses with Haldeman, in a LOUD voice:
President Nixon: I don't want anybody to lie about Watergate, you know what I mean ?
Haldeman: Yes, sir, Mr. President .