- Life of Cassius Marcellus Clay
- The Writings of Cassius Marcellus Clay,: Including Speeches and Addresses
- Speech of C. M. Clay, of Fayette, in the House of Representatives of Kentucky, January 1841, Upon the Bill to Repeal the Law of 1835, to Prohibit the Importation of Slaves Into This State ..
- Speech of C. M. Clay, at Lexington, KY. Delivered August 1, 1851
- Speech of C. M. Clay Before the Young Men's Republican Central Union of New York in the Tabernacle, October 24th, 1856