U.S. National Archives (Record Group 104, Entry UD-39) Special File of Correspondence on Coinage and Booth Examination Público Deposited
Multiple topics, including James C. Booth’s examination of southern mints for return to coinage production.
National Archives catalog entry is https://catalog.archives.gov/id/23888984. See also the National Archives & Records Administration numismatic finding aids at https://nnp.wustl.edu/library/archivedetail/538870.