World War I with Calvin, Hunter and Zachary

Links

http://www.worldwar1.com/
http://www.firstworldwar.com/features/trenchlife.htm
http://hubpages.com/hub/World_War_1_Trench_Warfare
http://www.revision-notes.co.uk/revision/927.html
http://en.wikipedia.org/wiki/Technology_during_World_War_I
http://www.historylearningsite.co.uk/treaty_of_versailles.htm
http://en.wikipedia.org/wiki/Treaty_of_Versailles
Textbook- The Americans Published by McDougal Littell