The book is a selection of lectures by members of the Societe d'Enseignement Mutuel du Tonkin with topics on: culture, history, ethnic groups, historical celebrities, literature, fine arts, scenic relics and medicine. In which, many members of the Societe d'Enseignement Mutuel du Tonkin have become famous people who have streets named after them: Song An Hoang Ngoc Phach, On Nhu Nguyen Van Ngoc, Dong Chau Nguyen Huu Tien, Thuc Ngoc Tran Van Giap..., many are scholars who left many valuable works such as: Pham Quynh, Tran Trong Kim, Do Than, Nguyen Tuong Phuong, Nguyen Can Mong...