Sumner, C. (1860). The barbarism of slavery.: Speech of Hon. Charles Sumner, on the bill for the admission of Kansas as a free state : In the United States Senate, June 4, 1860. Washington, D.C.: T. Hyatt.

Sumner, Charles. The Barbarism of Slavery.: Speech of Hon. Charles Sumner, On the Bill for the Admission of Kansas As a Free State : In the United States Senate, June 4, 1860. Washington, D.C.: T. Hyatt, 1860.

Sumner, Charles. The Barbarism of Slavery.: Speech of Hon. Charles Sumner, On the Bill for the Admission of Kansas As a Free State : In the United States Senate, June 4, 1860. Washington, D.C.: T. Hyatt, 1860.