Letter from the Secretary of the Treasury, transmitting a report of the Director of the Mint, containing the results of the assays of foreign gold and silver coins
U.S. Mint Reports (1814)
The Mint Director's report on the assay of foreign coins. The same text is in the American State Papers, finance (class 3), volume 2, no. 401.
Paul Hybert summary: "An assay of foreign coins, from mint director Robert Patterson to Acting Treasury Secretary William Jones, who relayed it to Congress."
A transcription is at http://www.chicagocoinclub.org/lib/us/asp/cl03.finance/v2/n401.html.