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Professional and personal files including Armstrong's correspondence with professional associations, other engineers, and friends, his research notes, circuit diagrams, lectures, articles, legal papers, and other related materials. Of his many inventions and developments, the most important are: 1) the regenerative or feedback circuit, 1912, the first amplified radio reception, 2) the superheterodyne circuit, 1918, the basis of modern radio and radar, 3) superregeneration, 1922, a very simple, high-power receiver now used in emergency mobile service, and 4) frequency modulation - FM, 1933, static-free radio reception of high fidelity. More than half the files concern his many lawsuits, primarily with Radio Corporation of America, over infringement of the Armstrong patents. Litigation continued until 1967. Other files deal with his work in the Marcellus Hartley Research Laboratory at Columbia University, 1913-1935, and with the American Expeditionary Forces in France during World War I, his Air Force contracts for communications development, Army research during World War II, the Radio Club of America, the Institute of Radio Engineers, FM development at his radio station at Alpine, N.J., the use of FM in television, his involvement in Federal Communications Commission hearings and legislation, and his work with the Zenith Radio Corporation. Also, letters to H.J. Round

The collection includes mostly drawings for Tudor's furniture designs and are arranged by drawing number. Notable projects include the design of the Interchemical Corporation offices, in collaboration with Robert Meyer, as well as the Vanadium Corporation of America offices. The collection also includes 9 sketchbooks. Sketchbooks #1-7 and #9 consist of drawings made by Tudor while likely an apprentice. Sketchbook #8 contains drawings made while working for White, Allom & Co. Notable clients include "Dr. A", "R.G.L." The scrapbook contains clippings and photographs presumably from his professional practice as some of the photographs are labeled "E.J. Tudor." Notable projects include the Rolling Rock Club (Pennsylvania), Dixon House (unknown location), Hampton Court (England), Whitemarsh Hall (England), Mellon Institute (Pittsburgh) and Henry C. Frick (New York). Other papers include correspondence related to the design of the Interchemical Corporation offices, collected print material, 21 photo negatives depicting various travel sites and 13 color charts arranged by manufacturer. The collection also contains lantern slides, which were used by Tudor to teach interior design at New York University. The slides show architectural views and details particularly English, French and American designs as well as interior views, details and furniture.

Correspondence, photographs, photographic plates, photostats, clippings, periodicals, and books relating to the history and literature of boxing and the prize ring from Homer to the 20th century. The correspondence, with related clippings, photographs, and photostats, is chiefly addressed to Magriel from outstanding figures in the sports world and from his publishers. It is arranged under general subject headings. Also, an unpublished typescript by Magriel on the history of pugilism.

Correspondence, manuscripts, playscripts, screenplays, diaries, documents, contracts, financial records, photographs, phonograph records, motion pictures, playbills, posters, sheet music, cartoons, art work, memorabilia, scrapbooks, and printed materials. . The collection consists chiefly of correspondence and production files relating to the creation, production, and performance of their works for stage, screen, radio, and television, such as Leave It To Me and Kiss Me Kate (with music by Cole Porter), Boy Meets Girl, and My Three Angels. Correspondence (with twentieth century authors, playwrights, musicians, political figures, and actors) includes: George Abbott, Jean Arthur, Bennett Cerf, Katharine Cornell, Jo Davidson, George and Ira Gershwin, Alec Guinness, W. Averell Harriman, Lilli Lehmann, Mary Martin, Laurence Olivier, Mary Pickford, Cole Porter, Regina Resnick, Eleanor Roosevelt, Robert E. Sherwood, Lincoln Steffens, Kurt Weill, Rebecca West, and Thornton Wilder. There is also correspondence concerning Bella Spewack's work with the New York Girls' Scholarship, UNRA, and the Sports Center of Israel. In addition to the production files, there are manuscripts and typescript drafts for novels, short stories, and articles by the Spewacks.