4 books
So You Think You Can Teach
History of the Underground Railroad as It Was Conducted By, the Anti-Slavery League
History of the Underground Railroad as It Was Conducted By, the Anti-Slavery League: Including Many Thrilling Encounters Between Those Aiding, the Slaves to Escape and Those Trying, to Recapture Them (Large Text Classic Reprint)
History of the Underground Railroad as It Was Conducted by the Anti-Slavery League, Including Many Thrilling Encounters Between Those Aiding the Slave