p.s. Do you know for a fact that your great-grandfather died in a "dirty reservation clinic"?

First of all, the people who were "removed" by the 1830 Indian Removal Act were not put on reservations. The entirety of Oklahoma was divided into communal territories just as the Indians had held in their original land. Then, under the Dawes Act, they lost their large territories and were "given" farms. They never had reservations, and they still don't.  Later tribes, like the Kiowa did have reservations, but not any of the five "civilized tribes." So I kind of question your belief regarding the "dirty reservation clinic."  
 
Did you know your great-grandfather, or is this a story from your family?  I accept the possibility that you are correct, but your facts don't line up (again).  G-grandpa may have died in an IHS clinic, but it was no "reservation" clinic unless you have heritage in some other Oklahoma tribe, a tribe that was not relocated under the 1830 act.