Three important Watergate books. John Dean paints a candid picture of the sickening moral bankruptcy which permeated the White House and to which he contributed. His memory of who said what and to whom is astounding. Samuel Dash provides a comprehensive account of how the Committee operated and what he thought and did as chief counsel. David Wise, an old hand at bringing light to bear on the clandestine, compiles the seemingly endless infringements by government agencies of the liberties of American citizens during the Nixon years.