- Two Lectures On the Natural History of the Caucasian and Negro Races
- Types of Mankind, or, Ethnological Researches
- Types of Mankind: Or, Ethnological Researches, Based Upon the Ancient Monuments, Paintings, Sculptures, and Crania of Races, and Upon Their Natural, Geographical, Philological and Biblical History
- Two Lectures On the Natural History of the Caucasian and Negro Races
- Two Lectures On The Connection Between The Biblical And Physical History Of Man