EquineB, here are a couple of links to info on the Quarter Horses
http://www.imh.org/imh/bw/quar.html#history
http://meme.essortment.com/quarterhorsesh_raga.htm
Were you looking for the original breeds that mixed to become the Quarter Horse or the founding sires names or what?
From these links you can see why I guessed they came from Turks, Barbs and Arabs but they also mixed with Spanish, Arabians, Morgans and Standardbred.