Rhodes, J. F.: History of the United States from the Compromise of 1850. 3 vols. New York, 1893-95.
Robinson, C.: The Kansas Conflict. New York, 1892.
Robinson, S. T. L.: Kansas, Its Interior and its Exterior Life. Boston, 1856.
Roosevelt, T.: Thomas Hart Benton. Boston, 1887.
Royce, J.: California from the Conquest in 1846 to the Second Vigilance Committee in San Francisco. Boston, 1886.
Schouler, J.: History of the United States Under the Constitution. 5 vols. New York, 1893.
Schurz, C.: Life of Henry Clay. 2 vols. Boston, 1887.
Schuyler, E.: American Diplomacy. New York, 1886.
Seward, W. H.: Autobiography, from 1801 to 1834, with a Memoir of His Life. New York, 1877.
Seward, W. H.: Life and Public Services of John Quincy Adams. Auburn, 1849.