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Dear Ms Pereyra-Vera:
Thank you for your question. We believe that the letter you seek is part of a series called Diplomatic and Consular Instructions of the Department of State, 1791-1801, which is available on microfilm publication number M28. The records are arranged by date, so the letter you seek will appear on Roll 2. This series can be ordered for $125 per roll; however, it is likely that you will also be able to acquire a copy through your university’s interlibrary loan program.
We have two separate resources for citing records; one is specific to Department of State records (view here) and the other is general guidance (Leaflet 17). You are welcome to use whichever best suits your needs.
We wish you the best with your research; please reply to this post if you have any questions.