Published through the Recovering Languages and Literacies of the Americas initiative, supported by the Andrew W. Mellon Foundation. A Native American language formerly spoken in hundreds of communities in the interior of California, Patwin (also known as Wintun Tʼewe) is now spoken by a small but growing number of language revitalizationists and their students. A Grammar of Patwin brings together two hundred years of word lists, notebooks, audio recordings, and manuscripts from archives across the United States and synthesizes this scattered collection into the first published description of the Patwin language. This book shines a light on the knowledge of past speakers and researchers with a clear and well-organized description supported by ample archival evidence. Lewis C. Lawyer addresses the full range of grammatical structure with chapters on phonetics, phonology, nominals, nominal modifiers, spatial terms, verbs, and clauses. At every level of grammatical structure there is notable variation between dialects, and this variation is painstakingly described. An introductory chapter situates the language geographically and historically and also gives a detailed account of previous work on the language and of the archival materials on which the study is based. Throughout the process of writing this book, Lawyer remained in contact with Patwin communities and individuals, who helped to ensure that the content is appropriate from a cultural perspective.