United States. Department of the Treasury. "Report on the Finances, December 1847," Annual Report of the Secretary of the Treasury on the State of the Finances (1847). https://fraser.stlouisfed.org/scribd/?item_id=5492&filepath=/files/docs/publications/treasar/AR_TREASURY_1847.pdf, accessed on December 16, 2017.
Extracted from Reports of the Secretary of the Treasury of the United States... Vol. VI