The crew that broke into the Watergate headquarters of the Democratic National Committee in 1972 also burglarized the Chilean Embassy weeks earlier as part of what President Richard M. Nixon called an asinine scheme to make both seem like a CIA operation. "{T}hat thing was a part of the burglars' plan -- as a cover," Nixon told a top aide a year later when the pressures of the Watergate scandals were closing in on the White House. "Those {expletive} were trying to have a cover -- or a CIA cover." Nixon's remarks were among long-classified snippets released yesterday at the National Archives as part of the Nixon White House tapes reflecting abuses of power. The break-in at the Chilean Embassy here took place over the May 13-15, 1972, weekend and was investigated by Watergate prosecutors in light of reports that two of the men who broke into and wiretapped DNC headquarters had carried it out with the help of another Cuban colleague. The prosecutors concluded the three Cubans, Frank Sturgis, Eugenio Martinez and Felipe de Diego, had probably done the job, but closed its inquiry when the FBI reported that its informer had been "murdered by an unidentified sniper" on April 12, 1974. Nixon blamed the Chilean caper on his ousted White House counsel John W. Dean III. "I think Dean concocted that," the president told his special counsel J. Fred Buzhardt in an Oval Office conversation on May 16, 1973. "It may come out that he concocted more than we know about, Mr. President," Buzhardt said. The two were discussing Dean's role in taking a copy of a controversial, but never-implemented plan for burglarizing and wiretapping domestic security targets with him when he left the White House. The document wound up with the Senate Watergate Committee. "Boy, the incredible treachery of the little {expletive}," Nixon told Buzhardt. In an effort to upstage the release at the archives yesterday morning, officials of the privately operated Nixon Library and Birthplace Foundation at Yorba Linda, Calif., put their version of the tapes, accompanied by their analysis of its meaning, on the Internet. The commentary attempts to give the Nixon camp's side of the story, depicting the late president as a victim of "America's argument with itself" over the war in Vietnam. As for the Watergate break-in and coverup that led to Nixon's downfall, the commentary asserts that Nixon "was motivated not by a desire to protect himself or anyone in the White House but to protect a longtime friend whom he had pressured to come to Washington in 1969 as his first Attorney General" -- John N. Mitchell. It also identified Dean as author of the idea to use the CIA to pressure the FBI into limiting the Watergate investigation. "This stuff is laughable; it's unbelievable," Dean said in a telephone interview after reading the pro-Nixon account on the Internet. He said he told White House Chief of Staff H.R. "Bob" Haldeman of Mitchell's limited suggestion to use the CIA to block an investigation of GOP campaign funds laundered in Mexico and used to finance the Watergate burglars. Dean said Haldeman broadened the idea of using the CIA in reporting it to Nixon, and Nixon seized on it as a way "to end the entire Watergate investigation." In a two-line transcription reminiscent of the Nixon White House's original editing of the Watergate tapes in 1973, the Nixon Foundation offered this version of an April 27, 1973, discussion between Nixon and Haldeman about Watergate burglar E. Howard Hunt and, purportedly, other Watergate defendants. The foundation version had Haldeman saying: "Keeping them {Hunt and other defendants} quiet on a national security matter." It then has Nixon replying: "Yes, we {can't?} do that." As heard yesterday at the Archives, however, the two men had this exchange: Nixon: "What we have to do is keep Hunt quiet." Haldeman: "And to keep him quiet on a national security matter." Nixon: "Yes, we can't have him or let him {unintelligible word} Ellsberg." Ellsberg was the former Pentagon official and anti-war activist who in 1971 had leaked to the news media the Pentagon Papers, a highly classified history of U.S. involvement in Vietnam. Hunt, while working for the Nixon White House, burglarized the offices of Ellsberg's psychiatrist in order to gain information about him. Staff researcher Nathan Abse contributed to this report.