I will try to find a government site for you out of CHicago that handles a lot of Native American information. They can be a great help to you. Best to search at the us government web site and it might be listed. It is an arm of the government where you can search back into time. I have read things on there that made me wonder how the government could treat anyone, the way they treated Native Americans, particularly back in the days when the reservations were formed. Good luck in your searches!