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Dear Mr. McDonald,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located Correspondence, Memorandums and Other Records, 1897 - 1994 and Architectural Drawings and Blueprints, 1897 - 1986 in the Records of the U.S. Mint (Record Group 104) that may contain the information you seek. Please be advised that the latter series is fully restricted and must be requested under the Freedom of Information Act (FOIA). Please email the National Archives at Denver (RM-DV) at email@example.com for more information.
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 RM-DV. We apologize for this inconvenience and appreciate your understanding and patience.
Also, there may still be records in the custody of the U.S. Mint regarding this topic. Please see their Freedom of Information Act (FOIA) page to submit a request.
We hope this is helpful. Best of luck with your research!