- Speeches, Lectures and Letters
- Toussaint L'Ouverture: The December 1861 New York and Boston Lecture
- Qataban and Sheba: Exploring the Ancient Kingdoms on the Biblical Spice Routes of Arabia -1st Edition/1st Printing
- Review of Lysander Spooner's essay on the unconstitutionality of slavery: reprinted from the "Anti-slavery standard," with additions
- Speeches, lectures, and letters Volume 1