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British heavy tanks of the First World War - Wikipedia
Tank Mark I (1916) - Tank Encyclopedia
Tanks in the British Army - Wikipedia
Mark I - The Tank Museum
Inside Mark I: The First Fighting Tank - YouTube
Weapons of War: Mark 1 Tank - non interactive version
Tank Mark I
United Kingdom of Great Britain and Ireland (WW1) - Tank …
BBC - History - World Wars: Weapons of War: Mark 1 Tank
Mark IV tank - Wikipedia