The NARA records are not accessible online and will need to be requested by the specific NARA agency where records are stored. Using the link below you can see a list of all federally run schools that NARA has records for.
The schools listed below have records stored at NARA Kansas City:
North Dakota: Bismarck Indian School, Fort Totten Indian School, and Wahpeton Indian School.
South Dakota: Chamberlain Indian School, Flandreau School, Hope School, Pierre Indian School, and Rapid City Indian School.
Minnesota: Pipestone Indian School, and Vermillion Lake Indian School.
Kansas:Haskell Indian Nations University
Source: Navigating Record Group 75: BIA Schools. National Archives. Last reviewed on June 25, 2018. https://www.archives.gov/research/native-americans/bia-guide/schools