I lost a note in history for trench system,?

Question:

I lost a note in history for trench system,?

I lost a note in history for trench system,?
Question Details: I lost a note in history for trench system, and I have a exam tommorrow and i just remembered and i went to try to find him at school today ,but he wasn't there.

What website can i see the trench system , the ones that you see for education. not the ones like (http://www.passmoresschool.com/hist...... because i have to draw them, like the trenches that are drawn by pencil, for example there is No Man's Land :front line ; dugouts ; communication trench ; support.

so i need a diagram,

Best Answer - Chosen by Asker: http://www.worldwar1.com/maproom.htm...
http://en.wikipedia.org/wiki/image:trenc...