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Tanks in World War I - Wikipedia
World War One Tanks - Tank Encyclopedia
The WWI tank that helped change warfare forever - BBC
Tanks in World War I - HISTORY CRUNCH
British heavy tanks of the First World War - Wikipedia
Tanks and Tank Warfare - 1914-1918-Online
The Dawn of American Armor: The U.S. Army Tank Corps in World War I
World War I: Why Were Tanks Invented? - TheCollector
World War I: Summary, Causes & Facts - HISTORY
Tanks in World War I | National WWI Museum and Memorial