- White Slavery in the Barbary States
- Memoir and Letters of Charles Sumner; Volume 4
- Charles Sumner; his complete works, (Volume 1) With an introduction by Hon. George Frisbie Hoar
- 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
- Prophetic Voices Concerning America