Rare American Tanks of WW1

During WW1 the U.S Military and several trarctor companies designed several tank prototypes for use on the western front during WW1 eres a list - 1916 Holt 75 tank - Holt Three-Wheeled Steam Tank - Best 75 Tracklayer Prototype Tank Caterpillar G-9 Prototype Tank - Model 75 Tank - Holt Gas Electric Tank US Army Corps of Engineers Steam Tank of 1918 - Pioneer Skeleton Tank Studebaker 1918 Tank - Hamilton ( also called Victoria) Tank of 1918 US Mark-1 or Ford 3 Man Tank of 1917 - Ford 3-Ton M191