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\F3\CSTANFORD, CALIFORNIA 94305
\F4COMPUTER SCIENCE DEPARTMENT\←L\-R\/'7;\+R\→.\→S   Telephone:
\←S\→.415-497-4971
\F1\CSept 26,1974






Dr. Barbara H. Liskov
Project Mac
Massachusetts Inst. of Technology
Cambridge, Mass. 02139


Hi:

\JGreetings from the ancient days at Stanford. It brings a tear to the
eye. In the interim I've collected a family, two years of teaching at UCLA,
and a mortgage.. no longer a (sigh) callow youth.

Is Zilles's report entitled "An Expansion of the Data-structuring Capabilities of PAL"
still available in hard copy? All we currently have is the microfiche version, and
it is of very poor quality. I would also like to run down a copy of the PAL notes
if possible.

The reason for this sudden activity is that I have been using a derivative
of LISP to study programming language design and the problems of clean
semantics for user-defined data structures. 
R. Milne's thesis contains another interesting approach, but uses a 
derivative of PAL. In search of PAL documentation I uncovered Zilles's report.

To make this really sound like a letter to Santa Claus, perhaps you 
could include your MAC reports on Abstract Data Structures.
\.
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Yours sincerely,



John R. Allen
Ancient Research Associate
Computer Science Dept
Artificial Intelligence Labs

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