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Civil War Maps - Many Civil War maps from the Library of Congress.
HistoryChannel.com - Battles, biographies, chronologies, primary sources, and more.
The History Place - Timeline, battles, primary sources, and more.
A House Divided - Includes: Lincoln's America; the Slavery Debate; War, Politics, and Society; and the Aftermath. Well illustrated, and includes many primary source documents. Provided by the Chicago Historical Society and the Gilder Lehrman Institute.
The Valley of the Shadow - Primary source documents from the Civil War include letters and diaries from a northern and a southern community. Provided by the Virginai Center for Digital History and the University of Virginia Library.