Cobb, T. R. R. 1. (1858). An inquiry into the law of Negro slavery in the United States of America: To which is prefixed, an historical sketch of slavery. Philadelphia : Savannah [Ga.]: T. & J.W. Johnson & Co. ; W. Thorne Williams.

Cobb, Thomas R. R. 1823-1862. An Inquiry Into the Law of Negro Slavery in the United States of America: To Which Is Prefixed, an Historical Sketch of Slavery. Philadelphia : Savannah [Ga.]: T. & J.W. Johnson & Co. ; W. Thorne Williams, 1858.

Cobb, Thomas R. R. 1823-1862. An Inquiry Into the Law of Negro Slavery in the United States of America: To Which Is Prefixed, an Historical Sketch of Slavery. Philadelphia : Savannah [Ga.]: T. & J.W. Johnson & Co. ; W. Thorne Williams, 1858.