http://www.mainehistory.org/programs_cw.shtml
http://www.nps.gov/civilwar/index.htm
http://topics.nytimes.com/topics/reference/timestopics/subjects/c/civil_war_us/index.html
http://www.civilwar.org/education/teachers/ (commercial but has good info)
http://www.civilwar.com/ (commercial but has good info)
