From the memoirs of the National Academy of Sciences, "The Manobos of Mindanao" is an exhaustive study of indigenous tribe of the Manobos. The title tackles the group's geography, ethnography, culture, religion, government, and customs. The book is the result of the author's four-year residence in Mindanao among the Manobos. During his stay, the author acquired the knowledge of their language and gives us an intimate glimpse of their culture, as well as a view of how the group sees their customs.