World War 1
Worldwar1.com: Trenches on the Web: Armory: Tanks: Page 1
This site provides a "Tank Comparison Table" outlining the specifications for several different types of tanks used in World War I, as well as photographs of tanks and descriptions.
World War 1
Worldwar1.com: Trenches on the Web: Armory: Tanks: Page 2
This site provides a chart with photographs of tanks used in World War I along with descriptions.