Letter from the Secretary of the Treasury, transmitting a report of assays at the Mint of the United States, of sundry foreign coins. : January 19, 1824. Referred to the Committee of Ways and Means
U.S. Mint Reports (1824)
The Mint Director (Robert Patterson) report on assay of foreign coins. The same text appears in the American State Papers, finance (class 3), volume 4, no. 689.
Paul Hybert summary: "An assay of foreign coins, from mint director Robert Patterson to Treasury Secretary Crawford, who relayed it to Congress. The recent assay results for the three types of foreign silver coins still current are stated — they are consistent with prior results. In addition, some recent British and Portuguese gold coins were assayed; no specimens of recent French or Spanish gold coins could be procured."
A transcription is at: http://www.chicagocoinclub.org/lib/us/asp/cl03.finance/v4/n689.html.