Note: Full book PDFs are rarely in a single file due to size. Most GitHub repos split the book into chapters (ch1.pdf, ch2.pdf, etc.).

Published by Pearson Education, James Allen’s book offers a balanced, comprehensive introduction to how computational systems can understand language. It is celebrated for breaking down the complex process of NLU into manageable, structured components. Core Strengths of the Second Edition (1994):

Building conversational agents that can plan, reason, and collaborate with humans.

Finding the James Allen "Natural Language Understanding" PDF