A Key to the Language of America, or an Aid to the Language of the Native Inhabitants of that Part of America called New England, together with brief Observations on the Customs, Manners, and Ceremonies, etc., of the aforesaid Natives, &c. written by Roger Williams. In this book, the author explores the language, culture, and customs of the indigenous peoples of New England. Roger Williams, an English priest and colonizer, studies the language and customs of the natives, trying to understand their culture more closely. The book is a valuable document for understanding the interaction between European settlers and Native Americans during the colonial history of North America.