Speech of Mr. Calhoun, of South Carolina, in reply to Mr. Turney, of Tennessee: delivered in the Senate of the United States, February 12, 1847., pamphlet, Date Unknown; (https://texashistory.unt.edu/ark:/67531/metapth498771/m1/1/: accessed March 29, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .