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Free Prolog Tutorials

ON-LINE GUIDE TO PROLOG PROGRAMMING
This is a second edition of former Interactive Prolog Guide that brings new design and better organization of chapters

Prolog Tutorial
This tutorial is intended to be used to help learn the essential, basic concepts of Prolog.

Prolog for Software Engineering
A tutorial by Peter B. Reintjes for the 1994 International Conference on the Practical Applications of Prolog

Prolog and Logic Programming
Several modules on Prolog programming.