"Designing and Programming Personal Expert Systems", by Carl Townsend
and Dennis Feucht, TAB Books, Blue Ridge Summit, PA, 1986.  

Price: $19.00 plus applicable taxes and shipping from LMI.

This new book is divided into two parts:

The first part is a general introduction to "Artificial Intelligence"
and Knowledge Systems (the author's term for rule-based expert systems), 
two topics which have only marginal overlap in my opinion.

The second part is example code for a simple rule-based system, all
implemented in Forth.

Both the text and the Forth code are readable and well presented.

Table of Contents:

Part I: EXPERT AND KNOWLEDGE SYSTEMS

Chapter 1.      Introduction to Artificial Intelligence.
Chapter 2.      Introduction to Knowledge Systems.
Chapter 3.      The Components of a Knowledge System.
Chapter 4.      Representing Knowledge.
Chapter 5.      Introduction to Knowledge Engineering.

Part II: BUILDING KNOWLEDGE SYSTEMS

Chapter 6.      Forth: A Versatile Expert Systems Language
Chapter 7.      Introduction to List Processing
Chapter 8.      Programming Techniques
Chapter 9.      A Prolog Knowledge System
Chapter 10.     Advanced Concepts.
Chapter 11.     Learning and Pattern Recognition.

Appendix A.     Source Listing (for Mini-Prolog in Forth)
Appendix B.     The Diagnosis Routines (for Appendix A) 
Appendix C.     Forth Vocabulary
Appendix D.     Expert Systems Tools [list of software vendors]
Appendix E.     Expert Systems [list of working & published systems]

Glossary [of AI terms]

Resources [Bibliography of useful Expert System articles and books]

Index