There is an interesting article in the NY Times (Dec. 6, 2010) about a map which shows a distribution of the slave population of the southern states of the United States. It was complied from the census of 1860 drawn by E. Hergesheimer.
Read more about it including the map at:
http://opinionator.blogs.nytimes.com/2010/12/09/visualizing-slavery
The map is also retrievable from the online map collections at the Library of Congress:http://hdl.loc.gov/loc.gmd/g3861e.cw0013200
Local Data Repository Infrastructure Matters
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