America's Protest on the Sinking of the Lusitania
BBC News: The Great War: 80 Years On
Britannica: Causes of World War I
Brother, Can You Spare a Billion?
Causes of World War I
Cher Ami: World War I Carrier Pigeon
Death of an Air Ace: 1918
Electronic Passport: The World Wars
Great War
History: Causes of World War I
Map of Romania - Post War Administrative Division
Map of World War I
The Sinking of the Lusitania
U-Boat Attack: 1916
World War I : Post War Society
World War I : Trenches on the Web
World War I : 1914-1918
World War I Document Archive