Operations of the Mint, 1840--and Medals : Message from the President of the United States, transmitting a report of the operations of the Mint of the United States and its branches during the year 1840 ...
U.S. Mint Annual Reports (1841)
Mint Director Robert M. Patterson's report for the year 1840.
From the Congressional serial set, 26th Congress, 2nd session, House Executive document no. 75.