The Beck Papers were the foundation upon which this work was built, James M. Beck left an extensive collection of letters to and from himself, scrapbooks holding a full newspaper record of his activities, a bound set of addresses, diaries for 1884 and 1902-1907, and a full set of briefs. All but the legal material is in the Firestone Library of Princeton University; the briefs are in the Law Library of the Library of Congress. Beck's books, magazine articles, pamphlets, and Congressional speeches and reports round out the available expressions of a highly vocal twentieth- century American conservative.
Also consulted were the collections of the Association Against the Prohibition Amendment, Albert J. Beveridge, Charles J. Bonaparte, William E. Borah, Joseph H. Choate, Charles Evans Hughes, Philander C. Knox, John Purroy Mitchel, Theodore Roosevelt, Elihu Root, Ellery C. Stowell, William H. Taft, and Woodrow Wilson, all in the Division of Manuscripts in the Library of Congress; of Albert S. Burleson, W. Bourke Cockran, and M. Louise Gross, in the Division of Manuscripts of the New York Public Library; of the League to Enforce Peace and Oswald G. Villard, in Harvard University's Houghton Library; of the Year Files, Appointment Clerk Files, Mail and Files Division, and Opinions of the Department of Justice in the National Archives, and the Reminiscences of Frederic R. Coudert, Sr., in the Oral History Research project of Columbia University.
These and the other sources of this study will be referred to in more detail in the footnotes following.