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These are open-access websites:
Library of Congress Web Guide: WWI
Wide variety of material related to World War I, including photographs, documents, newspapers, films, sheet music, and sound recordings
Medicine in WWI
From the United States World War I Centennial Commission
The World War I Document Archive
Assembled by volunteers of the World War I Military History List (WWI-L), international in focus, presenting primary documents concerning the Great War, including information about "The Medical Front"
World Wars: World War One
From the BBC, the causes, events, and people of the conflict
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Library photo courtesy of Barry Halkin Photography