The correct answer is 'A Key into the Language of America'.
It is a book written by Roger Williams, published in 1643.
It describes the American Indian languages in New England in the 17th century and it is the first study of an Amerindian language in English.
The book concentrates on the language of the Narragansetts tribe, describing the grammar and the most common phrases of its language. It is also a study of culture of the Natives, the author goes deeply into the Natives' habits, starting with eating and sleeping habits, then moves to entertainment and daily practices and finishes with sickness, death and burial.
Williams also provides a list of vocabulary and little poems. His book is a great source of information about the Natives, how they eat, cloth themselves, the way they interact with one another, their customs and rituals.