Correspondence, memoranda, diaries, journals, writings, reports, printed material, scrapbooks, and records of the Army and Navy Journal primarily documenting O'Laughlin's career as a newspaperman. Includes correspondence with his wife, Mabel Hudson O'Laughlin, written during his World War I military service in Europe as well as material pertaining to his years as vice president of the Lord & Thomas advertising agency in Chicago, Ill. Subjects include advertising, lobbying, patronage, the Republican Party, Franklin D. Roosevelt and the New Deal, military policy, foreign affairs, the Anglo-German Venezuelean blockade (1902), the Billy Mitchell trial, Washington, D.C. social life, and Norwich University, Northfield, Vt.

Correspondents include Albert Jeremiah Beveridge, Camille Chautemps, Bainbridge Colby, Calvin Coolidge, Ira Copley, Josephus Daniels, Charles Gates Dawes, Fred Morris Dearing, Thomas E. Dewey, Hugh Gibson, Otis Allan Glazebrook, George W. Goethals, James G. Harbord, Thomas Charles Hart, Will H. Hays, Charles Dewey Hilles, Herbert Hoover, Patrick J. Hurley, Hiram Johnson, Theodore G. Joslin, Frank B. Kellogg, Julius Klein, Arthur Bliss Lane, Albert Davis Lasker, Henry Cabot Lodge, William Loeb, Francis B. Loomis, Douglas MacArthur, James Clark McReynolds, James G. Mitchell, Dwight W. Morrow, George Van Horn Moseley, Harry S. New, Kichisaburō Nomura, John J. Pershing, Gifford Pinchot, Lawrence Richey, Mary Roberts Rinehart, Edith Kermit Carow Roosevelt, Eleanor Butler Roosevelt, Theodore Roosevelt, David Sarnoff, Reed Smoot, Sir Cecil Spring Rice, Freiherr Hermann Speck von Sternburg, Edward R. Stettinius, Oscar S. Straus, Lawrence Sullivan, Charles Pelot Summerall, William H. Taft, Baron Kogoro Takahira, Harry S. Truman, Joseph P. Tumulty, David I. Walsh, William Allen White, Leonard Wood, Robert C. Wood, and Harry Hines Woodring.