U.S. National Archives (Record Group 104 [Denver], Sequence 77, Miscellaneous Correspondence)
Correspondence, Memorandums and Other Records, 1897 - 1994.
National Archives (NARA) series description:
This series consists of correspondence and memorandums pertaining to operations of the Denver Mint. Included are civil service examination results, personnel certificates, construction contracts, organizational charts, employee newsletters, newspaper clippings, tour and exhibit packets, and coin production and design reports.
The National Archives catalog record is at https://catalog.archives.gov/id/2329202. Accession number is 8NS-104-94-077. See also the National Archives & Records Administration numismatic finding aids at https://nnp.wustl.edu/library/archivedetail/538870.