* The Secession Movement, 1860–1861 (1931)
* Robert Liston: Surgeon of Edinburgh (1937)
* The Presidency of Zachary Taylor (1945)
* Southern editorials on secession (1949)
* America in our time: 1896-1946 (1947)
* Antislavery: The Crusade for Freedom in America (1961)
* Wendell Phillips (1964)
* The life and times of Zachary Taylor (1941)
* America in our time, 1896-1946 (1947)
* Letters of James Gillespie Birney, 1831-1857 (1938)
* William Lowndes Yancey (1947)
* The Letters of Andrew Jackson (1917)
* The Antislavery Origins of the Civil War in the United States (1939)
* The National Archives and the Historian (1949)
Articles
* "William Lowndes Yancey, Orator of Secession." North Dakota Historical Quarterly (1948): 129-162.
* "The Anti-Slavery Movement and the Presidential Election of 1844." Journal of Southern History (1940): 509-531.
* "The Constitutional Right of Secession." Tennessee Law Review (1944): 1-18.
* "The Southern Press on the Impending Crisis, 1846-1861." Mississippi Valley Historical Review (1928): 634-651.
* "Some Aspects of the Antislavery Movement." Journal of Negro History (1929): 21-36.
* "The Wilmot Proviso and the Southern Sectionalists." Mississippi Valley Historical Review (1928): 489-510.