1984
The fourth edition contains 922 pages — the most of any edition. Again, the pace of change in bridge is great as Richard Frey, now Editor Emeritus having been succeeded as Editor-in-Chief by Henry Francis, notes in the Foreword,
...a quantum leap in the technical material...many new and intriguing methods and ideas have made their appearance in the past seven years, and some have been widely adopted.
The organization of the fourth edition follows that of the third and second.
Read more about this topic: The Official Encyclopedia Of Bridge, Fourth Edition