Bowman, John S, ed. The Cambridge Dictionary of American Biography. Cambridge: Cambridge University Press, 1995. REF CT213.C36 1995
Since this is a biographical dictionary, it is easy to look up a person by their last name. Synopses are given of their lives and Harriet Tubman, one of the more prominent persons involved, is included.
Forsythe, Harold S. Dictionary of American History. Stanley I. Kutler editor-in-chief. vol. 8. New York: Charles Schribner's Sons, 2003. 249-251.
REF E174.D52 2003
This lengthy dictionary entry gives a good overall definition and the place of the Underground Railroad in history. There are see also references and a bibliography.
