- White Slavery in the Barbary States
- Charles Sumner; his complete works, (Volume 1) With an introduction by Hon. George Frisbie Hoar
- Memoir and Letters of Charles Sumner; Volume 4
- No Property in Man: Speech of Hon. Charles Sumner, on the Proposed Amendment of the Constitution Abolishing Slavery Through the United States, in the Senate of the United States, April 8th, 1864
- 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; Volume 1