Park Record Media Center

The original Nixon White House tape and original tape recorder are shown in an undated file photo from the National Archives. The last 340 hours of tapes from President Richard M. Nixon's White House were released Wednesday, Aug. 21, 2013, along with more than 140,000 pages of text materials. (AP Photo/National Archives, File) ( Nixon Tapes )

On the day of his resignation, Aug. 9, 1974, Richard M. Nixon waves goodbye from the steps of his helicopter as he leaves the White House following a farewell address to his staff. The Watergate scandal forced Nixon to become the first U.S. president to resign from office. (AP Photo/Chick Harrity) ( NIXON FAREWELL )

American politician Richard Nixon (1913 - 1994) at the White House with his family after his resignation as President, 9th August 1974. From left, son-in-law David Eisenhower, Julie Nixon-Eisenhower, Richard Nixon, Pat Nixon (1912 - 1993), Tricia Nixon and her husband Edward Cox, August 1974. (Photo by Keystone/Hulton Archive/Getty Images) ( 00f/33/huty/14778/26 )

President Richard M. Nixon is shown pointing to the transcripts of the White House tapes in this April 29, 1974, file photo, after he announced during a nationally-televised speech that he would turn over the transcripts to House impeachment invesigators. 30 years ago, on Aug. 9, 1974, US-President Richard M. Nixon resigned due to the Watergate affair. (AP Photo) ( USA WATERGATE JAHRESTAG )

8th August 1974: American president Richard Nixon (1913 - 1994) announces his resignation on national television, following the Watergate scandal. (Photo by Pierre Manevy/Express/Getty Images) ( 99t/40/huty/13877/15 )

In this Aug. 9, 1974 black-and-white file photo, President Richard M. Nixon and his wife Pat Nixon are shown standing together in the East Room of the White House in Washington. Thirty-six years after Nixon testified secretly to a grand jury investigating Watergate, a federal judge orders the first public release of the transcript. (AP Photo/Charlie Harrity, File) ( Nixon Watergate Testimony )

An exterior view of the Watergate Hotel in Washington, D.C. which contained the headquarters of the Democratic National Party burglarized on June 17, 1972 and leading to the resignation of Richard Nixon in 1973. (Photo by Hulton Archive/Getty Images) ( T506101_01 )

Former President Richard M. Nixon, right, answers questions of David Frost, left, during paid-for interview that was telecast, Wednesday, May 4, 1977. Interview took place at an unidentified home in South Laguna, Calif. Photo from WNEW - TV monitor. The telecast came 1,000 days after Nixon resigned in disgrace over the Watergate Scandal. (AP Photo/WNEW TV/Ray Stubblebine) ( Frost Nixon Interview 1977 )

Former President Richard M. Nixon, exhibited this expression, Wednesday, May 4, 1977 of paid-for interview with David Frost. Nixon conceded that he let his friends, the nation, and our "Systems of government" Down, but emphasized that he had not committed an impeachable offenses in his own view, in the Watergate coverup. (AP Photo/WNEW TV/Ray Stubblebine) ( Frost Nixon Interview 1977 )

This image provided by the National Archives and Records Administration shows one of two pages of notes taken by White House chief of staff H.R. Haldeman during a June 20, 1972, meeting with President Richard M. Nixon. The notes reflect the president's fear that the office in the Executive Office Building might be bugged and proposes hitting back against critics early in the Watergate scandal. "Hit the opposition w their activities," the notes say. "We shld be on the attack _ for diversion." (AP Photo/Courtesy of the National Archives and Records Administration) ( Missing Watergate Notes )

In this June 18,1973 file photo, Soviet leader Leonid I. Brezhnev, left, whispers in the ear of President Richard M. Nixon as the two leaders stand on a balcony at the White House in Washington. The meeting was the only summit ever recorded on an American presidential taping system. The last 340 hours of tapes from Nixon's White House were released Wednesday, Aug. 21, 2013, along with more than 140,000 pages of text materials. (AP Photo/File) ( Nixon Tapes )

President Nixon tells a White House news conference, March 15, 1973, that he will not allow his legal counsel, John Dean, to testify on Capitol Hill in the Watergate investigation and challenged the Senate to test him in the Supreme Court. (AP Photo/Charles Tasnadi) ( NIXON WATERGATE )

This photograph shows the first and last pages of the complaint filed in federal court in Washington, D.C., by the Senate Watergate Committee, Thursday, Aug. 9, 1973. The complaint names as defendant Richard M. Nixon, individually and as President of the United States. The signatures appear on the last page of the complaint. (AP Photo)

President Nixon, left, stands next to John D. Ehrlichman, Nixon's domestic affairs adviser, in the White House in 1971 at the start of Nixon's third year in office. Ehrlichman, who was imprisoned for 18 months for his part in the Watergate conspiracy, died Sunday Feb. 14, 1999 of natural causes at the age of 73. (AP Photo/file) ( OBIT EHRLICHMAN )

A historical marker on August 19, 2011 notes the parking garage in the Rosslyn neighborhood of Arlington, Virginia, where Washington Post reporter Bob Woodward met in secret with his source "Deep Throat" (Senior FBI official Mark Felt) as Woodward investigated former US President Richard Nixon and the Watergate scandal in 1972 and 1973. The scandal ultimately lead to Nixon's resignation in 1974. (SAUL LOEB/AFP/Getty Images) ( Was4169755 )

A historical plaque is seen at the Watergate complex in Washington, DC, June 11, 2012. June 17, 2012 marks the 40th anniversary of the infamous Watergate break-in, which brought down the presidency of Richard M. Nixon. Nixon resigned in August 1974 for his administration's role in a June 17, 1972, burglary of the Democratic National Committee headquarters at the Watergate complex in the US capital and the subsequent cover-up. He became the only American president ever to resign the office. Many inaccurate ideas and myths related to Nixon's role in the burglary and its cover-up have found long life over the years, reporters Carl Bernstein and Bob Woodward, who broke the story, wrote in an op-ed piece The Washington Post Saturday. (JIM WATSON/AFP/GettyImages) ( Was6566947 )

29th July 1974: A prayer vigil in support of Republican President Richard Nixon during the Watergate crisis. (Photo by Keystone/Getty Images) ( 98t/44/huty/12911/17 )

The Watergate Hotel is seen in Washington, DC, June 11, 2012. June 17, 2012 marks the 40th anniversary of the infamous Watergate break-in, which brought down the presidency of Richard M. Nixon. Nixon resigned in August 1974 for his administration's role in a June 17, 1972, burglary of the Democratic National Committee headquarters at the Watergate complex in the US capital and the subsequent cover-up. He became the only American president ever to resign the office. Many inaccurate ideas and myths related to Nixon's role in the burglary and its cover-up have found long life over the years, reporters Carl Bernstein and Bob Woodward, who broke the story, wrote in an op-ed piece The Washington Post Saturday. (JIM WATSON/AFP/GettyImages) ( Was6566942 )

Herbert Miller, left, attorney for former President Richard M. Nixon, holds the door open for Special Watergate prosecutor Henry Ruth as they leave the U.S. Court of Appeals in Washington, Feb. 1, 1975. Miller asked the court to stay a lower court's ruling on ownership of presidential papers. (AP Photo/Charles Harrity) ( Nixon Papers Miller )

In this May 7, 1973, file photo, reporters Bob Woodward, right, and Carl Bernstein, whose reporting of the Watergate case won them a Pulitzer Prize, sit in the newsroom of the Washington Post in Washington. On Monday, Aug. 5, 2013, the Washington Post announced the paper has been sold to Amazon founder Jeff Bezos. One of key dates in the history of The Washington Post was when the Post began reporting on the break-in at the Democratic National Committee's offices at Washington's Watergate hotel. (AP Photo) ( Washington Post Key Dates )

Watergate reporters Carl Bernstein, left, and Bob Woodward talk on the set before their appearance on the NBC-TV "Today" program, in New York Thursdday June 2, 2005. Carl Bernstein said "it's a very strange feeling" now that the Watergate source known as "Deep Throat" has been publicly identified. (AP Photo/Richard Drew) ( DEEP THROAT )

President Nixon tells White House newsmen, March 15, 1973, that he will not allow his legal counsel, John Dean, to testify on Capitol Hill on the Watergate investigation. (AP Photo/Charlie Tasnadi) ( NIXON WATERGATE )

Former FBI official W. Mark Felt waves to reporters with his daughter Joan Felt May 31, 2005 in Santa Rosa, California. An article written in Vanity Fair magazine claims that Felt was "Deep Throat," the long-anonymous source who leaked secrets about President Nixon?s Watergate cover-up to The Washington Post in the early 1970's. (Photo by Justin Sullivan/Getty Images) ( 52994625JS008_Magazine_Reve )

The Richard Nixon Centennial Exhibit at the Richard Nixon Presidential Library in Yorba Linda. (Feb. 13, 2013) Leo Jarzomb/San Gabriel Valley Tribune) ( 2-13-13 PREVIEW )

Richard M. Nixon waves a final farewell from the helicopter steps as he leaves the White House for the last time after resigning as president , Aug. 9, 1974. (AP Photo) ( RICHARD NIXON FAREWELL )

A wreath is laid at the gravesite of former President Richard Nixon in honor of his 99th birthday during a wreath-laying ceremony at the Richard Nixon Presidential Library in Yorba Linda on Monday January 9, 2012. The Richard Nixon Foundation hosts a formal ceremony of the laying of the White House Wreath from President Barack Obama by Admiral Mike Shatynski, of Whittier, along with President Nixon’s younger brother Ed Nixon and Colonel Jack Brennan, Marine Aide to the 37th President. (SGVN/Staff photo Keith Durflinger/SWCITY) ( 1-9-12 NIXONBIRTH09 )

President Richard Nixon's Presidential Wreath Laying Ceremony for his 98th birthday anniversary at the Memorials of President and Mrs. Nixon burial site at Richard Nixon Library and Birthplace in Yorba Linda on Sunday, Jan. 9, 2011. (SGVN/Staff photo by Watchara Phomicinda/SWCity)

Bronze statues of President Richard Nixon and Chinese Premier Zhou Enlai shaking hands is displayed as part of the Richard Nixon Centennial Exhibit that opened Friday at the Richard Nixon Presidential Library in Yorba Linda. Items in the exhibit are pictured Feb. 13, 2013. (SGVN/Staff photo by Leo Jarzomb) ( 2-13-13 PREVIEW )

The Richard Nixon Centennial Exhibit that opened at the Richard Nixon Presidential Library in Yorba Linda. Items in the exhibit are pictured Feb. 13, 2013. (SGVN/Staff photo by Leo Jarzomb) ( 2-13-13 PREVIEW )

A photo of Richard Nixon, top center, on the Whittier College football team is on display as part of the Richard Nixon Centennial Exhibit that opened at the Richard Nixon Presidential Library in Yorba Linda. Items in the exhibit are pictured Feb. 13, 2013. (SGVN/Staff photo by Leo Jarzomb) ( 2-13-13 PREVIEW )

For the first time in history, five US presidents gathered in one place. George HW Bush, Ronald Reagan, Jimmy Carter, Gerald Ford and Richard Nixon appear in the courtyard of the Ronald Reagan Presidential Library in Simi Valley Calif., November 04 1991. (Los Angeles Daily News file photo)

Richard M. Nixon Library and Birthplace, Yorba Linda, Ca., February 19, 2007. Presidents Day. The Library charged no addmision fees to the public and free cherry pies to the first 100 visitors in honor of the holiday. (Whittier Daily News file photo) ( 2-19-07-4 PREZDAY 2 )

The Richard Nixon Centennial Exhibit opened Friday at the Richard Nixon Presidential Library in Yorba Linda. Items in the exhibit are pictured Feb. 13, 2013. (SGVN/Staff photo by Leo Jarzomb) ( 2-13-13 PREVIEW )

Tricia Nixon Cox, eldest daughter of President Richard Nixon, approaches the wreath to present as the Richard Nixon Presidential Library holds a ceremony commemorating the 100th anniversary of the birth of President Richard Nixon Sunday, January 6, 2013, at the Richard Nixon Presidential Library in Yorba Linda. (Jennifer Cappuccio Maher/Inland Daily Bulletin) ( ON07-NIXON-01-JCM )