"Speech of William H. Seward. on the Abrogation of the Missouri Compromise, in the Kansas and Nebraska Bills", text, February 17, 1854; (https://texashistory.unt.edu/ark:/67531/metapth31699/m1/1/: accessed July 10, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .