Here are the materials in Martinez v. State (Okla. Ct. Crim. App.):
reservation disestablishment
Amicus Briefs Supporting Osage Petition for En Banc Hearing in Reservation Disestablishment Case
Here:
The petition and other materials are here.
Osage Nation Petition for Rehearing Reservation Disestablishment Case
Here: Osage Petition for Rehearing
Earlier materials are here.
Osage Nation v. Oklahoma Tax Commission — Reservation Diminishment
The Northern District of Oklahoma recently rejected the claims of the Osage Nation that Osage County is Indian Country (news article, via Indianz) — osage-nation-v-otc-dct-order
Here are the materials:
osage-opposition-to-motion-to-dismiss
otc-reply-brief-in-support-of-motion-to-dismiss
otc-supplemental-brief-motion-for-summary-judgment
What Remains of the Yankton Sioux Reservation?
After a decade of litigation, a federal court (D. S.D.) held a trial and reached a decision as to “what remains of the Yankton Sioux Reservation following the Supreme Court’s decision in South Dakota v. Yankton Sioux Tribe, 522 U.S. 329, 358 (1998).” Slip op. at 2.
Here are the materials:
Turtle Talk 
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