1. By: Kallie Traylor; Daniel Hamlett; Anette Aguilera; and Ryan Elam

2.  Horse wearing gas mask

3.  Gas mask

4.  Canine wearing gas mask

5.  Tear gas container

6.  Mustard gas effects

7.  Mustard gas containers

8.  Trench foot

9.  Trench mouth

10.  Trench rats

11.  Trenches

12.  Machine gun

13.  Pistol

14.  Machine gun and ammunition

15.  Rifles

16.  Machine gun on battlefeild

17.  Trench knife

18.  Cannon

19.  Hand grenades

20.  Tank

21.  theworldwar.org  http://www.harrymcfee.com/history.html  worldwar2facts.info  scholarsproject.blogspot.com  library.thinkquest.org  http://www.vlib.us/medical/gaswar/gasmasks.htm  http://www.oldmagazinearticles.com/WW1-German_Leather_Gas_Mask  tumblr.com  http://www.vlib.us/wwi/resources/archives/images/i040823a/key.html  http://www.rumormillnews.com/cgi-bin/archive.cgi/noframes/read/89969  fightingknives.info  http://desert-column.phpbb3now.com/viewtopic.php?f=8&p=9872  http://en.wikipedia.org/w  https://sites.google.com/a/adamscott.ca/world-war-i-museum-feb-2010/illness-and-disease-medicine-room-for-the-first-world-war  iki/Trench  https://sithttp://www.deactivated-guns.co.uk/images/uploads/0asmlesnip/0asmlesnip-035087_10.jpg  es.google.com/a/adamscott.ca/world-war-i-museum-feb-2010/illness-and-disease-medicine-room-for-the-first-world-war