Underground Railroad

http://www.nationalgeographic.com/railroad/

http://teacher.scholastic.com/activities/bhistory/underground_railroad/

http://magma.nationalgeographic.com/ngexplorer/0301/adventures/

http://pathways.thinkport.org/flash/ftf_1_0.html

http://americanhistory.pppst.com/undergroundrailroad.html