Dear Mr. Brown,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located the series titled Letter Books, 1793 - 1804 in the Records of the Bureau of the Public Debt (Record Group 53) that consists of fair copies of letters written by the Pennsylvania Commissioner of Loans to Secretary of the Treasury Alexander Hamilton and others. In addition, we located 31 series in Record Group 53 that pertain to Revolutionary War indebtedness. For more information about these records, please contact the National Archives at College Park - Textual Reference (RDT2) at firstname.lastname@example.org.
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 RDT2. We apologize for this inconvenience and appreciate your understanding and patience.
We hope this is helpful. Best of luck with your research!