Need some help figuring out how to find and access correspondence in Record Group 75, Records of the Bureau of Indian Affairs? Rose Buchanan, Archivist and Subject Matters Expert for Native American Related Records, has a recent blog post on Accessing the Letters Received by the Office of Indian Affairs, 1881-1907, at https://historyhub.history.gov/community/american-indian-records/blog/2022/08/09/accessing-the-letters-received-by-the-office-of-indian-affairs-1881-1907 that will help you get started! From there, you can also easily access other blog posts by Rose as well as Cody White, NARA’s other Subject Matters Expert for Native American Related Records.