Depots of the underground railroad

"The Underground Railroad was the massive effort by slaves and free people to secretly bring thousands of blacks to freedom in the North during the 19th century. This [book teaches readers] ... about the many safe havens, called 'depots,' that housed fugitives and the secret passages within them that hid slaves from their pursuers. Information about the American Civil War and the Fugitive Slave Act, biographies of figures vital to the Underground Railroad, and ... photographs and artwork are included in this ... work"--Provided by publisher.