James Allen's textbook "Natural Language Understanding" (2nd edition, 1995) is copyrighted, though the first chapter is available via the University of Florida
Syntax & Semantics: Focuses on feature-based context-free grammars and chart parsers. natural language understanding james allen pdf github link
Even if a direct GitHub link dies, copy the raw URL and paste it into web.archive.org. Many old PDFs from 2015-2018 are preserved. Are you a student with no access to a university library
A comprehensive Chapter 1 Introduction is available from the University of Florida, which outlines the different levels of language analysis and the goals of NLU research. A comprehensive Chapter 1 Introduction is available from