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BBC
Bbc History: World Wars: World War One
In-depth look at World War I. Includes summaries of the war years; sound clips of eye-witness accounts; virtual tours of trenches on the Western Front; maps; articles and overviews; and similar resources.
First World War
Safe Surf: Summary Timeline
This site contains a timeline of World War I. Each year is separated in the timeline. Includes links to all kinds of information about the war.
US National Archives
Nara: Military Resources World War I
A compilation of resources on World War I from the National Archives and Records Administration, including links to external sites.