1900-1932
- Blum, John Morton The Republican Roosevelt. (1954). essays that examine how TR did politics
- Brands, H.W. Theodore Roosevelt (2001), full biography
- Burner, David. Herbert Hoover: A Public Life. (1979).
- Chace, James. 1912: Wilson, Roosevelt, Taft, and Debs - The Election That Changed the Country. (2004). 323 pp.
- Coletta, Paolo Enrico. The Presidency of William Howard Taft (1973), standard survey
- Garraty, John. Henry Cabot Lodge: A Biography 1953
- Gosnell, Harold F. Boss Platt and His New York Machine: A Study of the Political Leadership of Thomas C. Platt, Theodore Roosevelt, and Others (1924)
- Gould, Lewis L. The Presidency of Theodore Roosevelt. (2nd ed. 2011)
- Gould, Lewis L. The William Howard Taft Presidency (2009)
- Gould, Lewis L. Four Hats in the Ring: The 1912 Election and the Birth of Modern American Politics (2008)
- Harbaugh, William Henry. The Life and Times of Theodore Roosevelt. (1963), full scholarly biography
- Hechler, Kenneth S. Insurgency: Personalities and Politics of the Taft Era (1940)
- Lichtman, Allan J. Prejudice and the Old Politics: The Presidential Election of 1928 (1979). quantitative study of voters
- Morris, Edmund. The Rise of Theodore Roosevelt, to 1901 (1979); vol 2: Theodore Rex covers 1901-1909. (2001); Colonel Roosevelt (2010), after 1909. Pulitzer prize biography.
- Mowry, George. The Era of Theodore Roosevelt and the Birth of Modern America, 1900-1912. (1954) general survey of era; online
- Miller; Karen A. J. Populist Nationalism: Republican Insurgency and American Foreign Policy Making, 1918-1925. Greenwood Press, 1999
- McCoy, Donald, Calvin Coolidge: The Quiet President (1967),
- Mowry, George E. Theodore Roosevelt and the Progressive Movement. (2001) focus on 1912
- Pringle, Henry F. The Life and Times of William Howard Taft: A Biography. 2 vol (1939); Pulitzer prize; the standard biography
- Pringle, Henry F. Theodore Roosevelt: A Biography (1931)
- Sherman, Richard B. The Republican Party and Black America from McKinley to Hoover 1973.
- Smith, Richard Norton. An Uncommon Man: The Triumph of Herbert Hoover, (1987) full-length scholarly biography.
- David Thelen, Robert M. La Follette and the Insurgent Spirit 1976. short interpretive biography
- Nancy C. Unger. Fighting Bob La Follette: The Righteous Reformer (2000), full scale biography
Read more about this topic: Bibliography Of The Republican Party