- Grammar of the language of the Lenni Lenape or Delaware Indians
- A Brief View of the Constitution of the United States, Addressed to the Law Academy of Philadelphia. (Da Capo Press Reprints in American Constitutional and Legal History)
- A Dissertation On The Nature And Extent Of The Jurisdiction Of The Courts Of The United States
- An Historical Account of the Origin and Formation of the American Philosophical Society
- A Dissertation On the Nature and Character of the Chinese System of Writing