Papers of the American humorist, journalist, author. Collections contains correspondence, 1892-1959; typescript mss. of articles, books, poems, speeches, and stories; notebooks; photographs; and memorabilia, including clippings, drawings, genealogical material, reviews, a scrapbook, and a subject file relating to Orville and Wilbur Wright, of whom Kelly wrote a number of articles and books. Correspondents include, among others, George Ade, Sherwood Anderson, Norman Angell, Newton D. Baker, Nicholas Biddle, Margaret Bourke-White, Bruce Catton, Winston Churchill, Irvin S. Cobb, Homer Croy, Warren G. Harding, Arthur Hosking, John T. McCutcheon, André Maurois, H.L. Mencken, William Sydney Porter (O. Henry), J. B. Priestley, Clarence Rook, Theodore Roosevelt, Vilhjalmur Stefansson, Ida Tarbell, Booth and Susanah Tarkington, Albert Payson Terhune, Harry S. Truman, Wendell Willkie, P.G. Wodehouse, Orville Wright, and Art Young.

Papers of the American editor, author of books on upstate New York folklore and children's literature. Correspondence, incoming and outgoing (1900-1962); notebooks (1920-1957); scrapbooks; manuscript books, essays, lectures, plays, and poems, as well as research material; published articles, books, and plays; and memorabilia, including photographs. Correspondents include Conrad Aiken, C.W. Anderson, Richard Atwater, Marjorie Barrows, Henry Bedford-Jones, Maxwell Bodenheim, Padraic Colum, Albert B. Corey, Homer Croy, James W. Earp, Walter D. Edmonds, and Vincent Starrett.