Letter from the Secretary of the Treasury, transmitting a report of the director of the Mint, giving the result of assays of the several foreign coins still current in the United States ...
U.S. Mint Reports (1822)
The Mint Director's report on assays made of foreign coins. The same text is also found in the American State Papers, finance (class 3), volume 3, report no. 625.
Paul Hybert summary: "An assay of foreign coins, from mint director Robert Patterson to Acting 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 case Congress is considering legislation regarding foreign coins, a statement of the average of the results, from the past five years, of assays on gold and silver coins is given."
A transcription is at: http://www.chicagocoinclub.org/lib/us/asp/cl03.finance/v3/n625.html. Note, this particular copy of the report is incomplete. The reader will find the full text at the link for the transcription.