Richard P. Gabriel released some of his CLOS-related papers on his home page, http://www.dreamsongs.com
I got:
The Common Lisp Object System by Linda G. DeMichiel
Common Lisp Object System by Linda G. DeMichiel and Richard P. Gabriel
The Common Lisp Object System: An Overview by Linda G. DeMichiel and Richard P. Gabriel
Common Lisp Object System Specification, 1. Programmer Interface Concepts and 2. Functions in the Programmer Interface by Daniel G. Bobrow, Linda G. DeMichiel, Richard P. Gabriel, Sonya E. Keene, Gregor Kiczales, and David A. Moon.
CLOS in Context: The Shape of the Design Space by Daniel G. Bobrow, Richard P. Gabriel, Jon L White
CLOS: Integrating Object-Oriented and Functional Programming by Daniel G. Bobrow, Richard P. Gabriel, Jon L White
… so I have plenty to read. :-)
NP: Foo Fighters—I’ll Stick Around