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Dear Mr. Griffin,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located the Correspondence of William Zimmerman, 1935 - 1948 in the Records of the Bureau of Indian Affairs (Record Group 75) that may include the letter you seek. For more information about these non-digitized records, please contact the National Archives at Washington, DC - Textual Reference (RDT1) at firstname.lastname@example.org.
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 RDT2. We apologize for this inconvenience and appreciate your understanding and patience.
We hope this is helpful. Best of luck with your research!