New York: Franklin Square Press, 1993; pb: $15.95 (ISBN 1879957132).
The Penguin edition (Baltimore: Penguin Books, 1974 [out of print]) contains an additional chapter written after the resignation of Richard Nixon, titled "Reflections on Watergate." So far as we have been able to discover, "Reflections" is not otherwise available.
The publication information above is derived from the bibliography prepared by Ronn Neff for TLD 13 and should be considered current only as of that time.
At the time of this posting in June 2002, Amazon.com is offering the Franklin Square edition in both paperback (new and used copies) and hardback (used).