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Dear Mr. Estess,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located the General Correspondence, 1792 - 1899 and the Correspondence and Records Used for Exhibition Purposes, 1947 - 1950 (documenting 1791 - 1936) in the Records of the U.S. Mint (Record Group 104) that contains correspondence of the Philadelphia Mint. For more information about these records, please email the National Archives at Philadelphia (RE-PA) at firstname.lastname@example.org.
We also located Letters Sent, 1873 - 1938; Letters Received, 1873 - 1932; and Papers and Correspondence, 1819 - 1979 in Record Group 104 that may include correspondence to the Philadelphia Mint from Bureau headquarters. For more information about these three series, please email the National Archives at College Park - Textual Reference (RDT2) at Archives2reference@nara.gov.
None of these record series have been digitized.
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 RE-PA and RDT2. We apologize for this inconvenience and appreciate your understanding and patience.
The National Archives does not have access to a copy of George A. Mallis's Comprehensive Catalog and Encyclopedia of Morgan and Peace Dollars and we were unable to locate a digitized copy online. WorldCat lists four editions of the work with the names of libraries that have copies. There may be additional libraries in your area whose holdings are not listed on WorldCat. A search online also turns up a number of online retailers that sell various editions of the work.
We hope this is helpful. Best of luck with your research!
Thank you so much for tracking down this information! This is all very helpful. I will follow these leads.