Information on the Steel Plow.?

I doing a project on the steel plow but there isnt much info out there. So far i can only find who it was invented by, a vague description of why it was invented and thats pretty much it. Does anybody know a lot about steel plows or know a website, other than wiki, that has a lot on the steel plow? i have to write a 3 page essay on it which is rather hard when i can find barely half a page of info about it.