by Dan Jurafsky and James H. Martin: Often cited as the most comprehensive NLP textbook. The authors provide frequently updated PDF drafts .
Many top-tier universities host their course materials publicly: Deep Learning for Natural Language Processing: Download Deep Learning for Natural Language Processing pdf
by Mihai Surdeanu and Marco A. Valenzuela-Escárcega: A "gentle" introduction focused on readers skilled in other domains. The full book PDF is hosted by the University of Arizona . Academic Course Materials (PDF Slides & Notes) by Dan Jurafsky and James H