Correspondence, newspaper clippings, reports, pictures, printed volumes of Fessenden patents, writings on scientific subjects, lectures, autobiography, and printer's proof of his book, "Deluged civilization." Correspondence and other papers relate to legal disputes over Fessenden's inventions, dealings with corporations, research and inventions in agricultural engineering, electric heating, short wave, television, aeronautics, submarine gyroscope, and radio, and include data on George Birkhoff, Thomas Edison, Lee de Forest, J. Marvin Roberts, Oscar C. Roos, Charles W. Ridinger, Elihu Root, Lambert Schmidt, E. Kilburn Scott, W. E. D. Stokes, C. J. Thatcher, F. L. O. Wadsworth, Orville Wright, and Wilbur Wright. Correspondents include American Telephone and Telegraph Company, Atlantic and Pacific Radio Corporation, Marconi Wireless, Radio Corporation of America, General Electric Company, and other corporations, the U.S. and foreign governments, and the Patent Office and patent attorneys.