Thank you for the information, Alice. I will try reaching out to them via their website, as I do not use Facebook. I was able to locate my mother's tribe roll information late last night (she had her tribe documents... it will be harder for my grandmother), which was a great aide in my efforts.
Dear Ms. Davidson,
Thank you for posting your request on History Hub!
There is a band of the Wintun that are federally recognized and administered out of the Northern California Agency of the BIA. Also, there are bands of Wintun that appear in several other reservations and some not federally recognized.
We searched the National Archives Catalog and located the series Individual Indian Probate Case Files, 1907 - ca. 1978 in the Records of the Bureau of Indian Affairs (BIA) (Record Group 75) that includes 127 files related to "Wintu" and 53 files related to "Wintun" that might be relevant to your research. These records have been digitized and may be viewed online using the Catalog. You may contact the National Archives at Seattle (RW-SE) at email@example.com for assistance with these and similar records.
Also, we located 4 series pertaining to census rolls of the Northern California Agency during 1948-1955 in Record Group 75. For access to these records, please contact the National Archives at San Francisco (RW-SB) via email at firstname.lastname@example.org.
In addition, you may be interested in an earlier History Hub question related to the Wintu (Wintun): Seeking BIA letter stating Wintu Indian Tribe p…, and more information about Native American Records in the National Archives, including information about Researching an Individual or Family, is available on NARA’s website.
Due to the COVID-19 pandemic and pursuant to guidance received from the Office of Management and Budget (OMB), NARA has adjusted its normal operations to balance the need of completing its mission-critical work while also adhering to the recommended social distancing for the safety of NARA staff. As a result of this re-prioritization of activities, you may experience a delay in receiving an initial acknowledgement as well as a substantive response to your reference request from RW-SE and RW-SB. We apologize for this inconvenience and appreciate your understanding and patience.
We hope this information is helpful. Best of luck with your family research!
[Some information provided by Cody White, Subject Matter Expert.]