"Testimony of witnesses : hearings, Ninety-third Congress, second session, pursuant to H. Res. 803, a resolution authorizing and directing the Committee on the Judiciary to investigate whether sufficient grounds exist for the House of Representatives to exercise its constitutional power to impeach Richard M. Nixon, President of the United States of America" . . . "Testimony of witnesses Hearings, Ninety-third Congress, second session, pursuant to H. Res. 803, a resolution authorizing and directing the Committee on the Judiciary to investigate whether sufficient grounds exist for the House of Representatives to exercise its constitutional power to impeach Richard M. Nixon, President of the United States of America"@en . . . . . . . . . . . . "1972 - 1974" . .