Artist Unknown, "Harriet Tubman, COnductor of the Underground Railroad for runaway Slaves, 19th c.Tubman, Harriet:

(c.1820-1913) Conductor of the Underground Railroad, Tubman was one of the bravest and most accomplished when it went to freeing slaves. Born into slavery, Tubman grew up working as a house servant. In 1849 she was worried that she was going to be sold to another plantation. Harriet escaped and made her way to Philadelphia. She would later come back for her sisters, brothers, and her husband on three separate occassions. She would make the trip between the north and south 19 times, never losing a passenger.

Source: http://www.pbs.org/wgbh/aia/part4/4p1535.html

Horton, James Oliver, and Lois E. Horton. Slavery and the Making of America. New York: Oxford, 2006. 118.