Page 27 has table showing number of slaves in the U.S. according to the U.S. Census of 1820.
Reproduction of original from Goldsmiths' Library, University of London.
Goldsmiths'-Kress no. 23661.
Electronic reproduction. Farmington Hills, Mich. : Thomson Gale, 2005. Available via the World Wide Web. Access limited to licensing agreements.