...United States census reports; and Olmsted, The Cotton Kingdom... 
W. E. B. Du Bois 「The Suppression of the African Slave Trade to the United States of America」
...United States census reports; and Olmsted, Cotton Kingdom...
W. E. B. Du Bois 「The Suppression of the African Slave Trade to the United States of America」
...Frederick Law Olmsted...
W. E. B. Du Bois 「The Suppression of the African Slave Trade to the United States of America」
...Hart, "Slavery and Abolition," 73; Olmsted, "The Back Country,"230-232...
Various 「The Journal of Negro History, Vol. I. Jan. 1916」
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