John Ludwig Krapf: The Explorer-Missionary of Northeastern Africa (1909) is a biographical account of the life and work of John Ludwig Krapf, a German explorer and missionary who played a significant role in the exploration and evangelization of northeastern Africa in the mid-19th century. Written by Paul E. Kretzmann, the book provides a detailed and comprehensive overview of Krapf's life, from his early years in Germany to his travels and missionary...