Osage Nation v. Irby, 597 F.3d 1117 (10th Cir. 2010)

(plaintiffs claim rejected that its reservation still exists and has the same boundaries as Osage County, Oklahoma; court held that the reservation had been disestablished by the Congress under the Osage Allotment Act of 1906; plaintiffs sought reservation status so as to regulate and tax business operations in the county).