U.S. National Archives (Record Group 104, [Denver] Entry 23, Copies of Letters Sent to the Superintendent 1906 - 1940)
National Archive series description: This series consists of copies of letters sent to the Superintendent of the U.S. Mint, Denver, by the Melter and Refinery Department. The letters relate to personnel issues, equipment and supplies, work projects, budgets, and work related injuries. Also included are copies of United States Mint Service Form 219, "Melter and Refinery of Bullion Balances".
The National Archives catalog record is https://catalog.archives.gov/id/2657941. See also the National Archives & Records Administration numismatic finding aids at https://nnp.wustl.edu/library/archivedetail/538870.
Scanned at the National Archives in Denver, CO, courtesy of John Graffeo. Roger W. Burdette contributed metadata to this series.