Popular with parents, teachers, and homeschoolers, these five-in-one volumes introduce readers to real Christian heroes from history. The fourth "Trailblazers" collection features central-Africa explorer David Livingstone and also includes author John Bunyan; missionary Maude Cary; missionary Mary Slessor; and, the "Livingstone of South America", Barbrooke Grubb. The fifth "Trailblazers" collection features famous church reformer Martin Luther and also includes missionaries Marcus and Narcissa Whitman, Governor William Penn, "Amazing Grace" hymnist John Newton, and missionary John G. Paton.