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Acknowledgements
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This book began informally at UCLA in 1970 as an alternative to the data
structures course. Any book which takes six years to complete must 
have a list of acknowledgements.
Between  the 1970 manuscript and the  present
version stretches an incredible list of revisions and rewritings.
That task was made possible only by the document
preparation system at the Stanford Artificial Inteligence Laboratory.


The final shape of this book has been guided by many sources, but particularly
I would like to mention Dr. Michael Burke of San Jose State Mathematics, who
allowed me to use my manuscript in their data structures course.
To Nancy Meller of the UCLA Computer Science Dept for typing the
orginal LISP notes.
To Les Earnest of the Stanford A.I. Labs for aid beyond the call of duty.
To Jim Duley of Hewlett-Packard for persisting.
To Paulette for trying to understand. 
To Richard Madnuck of The Stanford Computer Science Dept Library, a most excellent
librarian with an exceptional library.
To John McCarthy for establishing an environment at Stanford which
was staffed so admirably and supplied with so may talented people;
and of course to  him for the
insight which lead to LISP.

Particular mention must go to  Guy Steele, who reviewed a much inferior
version of this text. His insights, comments, and criticisms 
were  invaluable. With comments like: "that's not a compromise, it's a
bloody surrender!", the text was bound to improve.


Several other people have had significant influence on the text. I feel fortunate
to list these individuals. 
D. Bruce Anderson,
Bob Boyer,
Michael Clancy,
Robert Cartwright,
Bob Doran,
Dan Friedman,
Dick Gabriel,
Michael Gordon,
Patrick Greussay, 
Tony Hearn,
Freidrich von Henke,
Forrest Howard,
Bill McKeeman, 
Peter Milne, 
J S. Moore,
Jorge Morales,
Sreve Russell, 
Hanan Samet,
Vic Scheinman,
Hebert Stoyan, 
Steve Ward 


For every author there must come a time when you have to say "Enough!".
I've been saying that for several years. It is particularly difficult
to  cease when dealing with a topic as  dynamic as LISP. Many sections
only hint at deeper problems, and surely some errors persist; but "Enough!".

As always it is the author's responsibility for the final shape of a
document; the substantial and textual errors, errors of ommission and comission
are all mine. Each of the reviewers objected strongly to one or more facets
of this book; to some, it was too theoretical; for some, too  practical.
I must have done something right.
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\To my parents, John & Esther Allen
\\To my wife and friend, Ruth E. Davis
\\\To my sons, Christopher & Geoffrey.