Hi Ronni, I just did "rodeo" ie: barrelracing, in my theme class at school. My little hutterite kids loved it!
I used books from the library at the school to get my info from. I can't remember all the books, because I don't have them with me. One of the books though was called, "Cowboys," it goes back to the old west days, where cowboys/girls got there start. It talks a little about barrel racing. As far as barrelracing up here, I got my start going to highschool rodeos, and to the CAARA association, later graduating on to the LRA, WRA, FCA, NRA, and so on. Is this what you meant? I hope this helps you a little. Have you tried going onto the internet, and typing in history of barrel racing? It might have something, but I'm not sure. Goodluck!