The first edition (Digital Press, 1984; ISBN 0-932376-41-X; 465 pages) was written by Guy L. Steele Jr., Scott E. Fahlman, Richard P. Gabriel, David A.
The second edition (Digital Press, 1990; ISBN 1-55558-041-6; 1029 pages) was written by Guy L. Steele Jr.
It reflected the then-current status of the standardizing process and documented important new features such as Common Lisp Object System (CLOS), the loop macro, and conditions.
Substantive additions and deletions were made between the time of the Second Edition and the final version of ANSI Common Lisp.
Also, series and generators were discussed in appendix matter of the Second Edition but were not a part of any working draft nor the final version of ANSI Common Lisp.