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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

Correspondence, writings, reports, memoranda, case files, and related printed materials. The papers cover the entire field of law with particular emphasis on civil rights, labor law, and family law. They include several series of office files dealing with Columbia University Law faculty, students, his course materials, and the administration of the Law School. In addition, there are numerous files for Amherst College (from which Gellhorn received his A.B. degree), arbitration cases, federal administrative procedure, legislation, the American Civil Liberties Union, the Association of American Law Schools, and Fordham University (for which he prepared a study). There are manuscripts, drafts, proofs, correspondence, and other related materials for some of his books: Administrative Law Cases and Comments (1940); Security, Loyalty and Science (1950); The States and Subversion (1952); Individual Freedom and Government Restraint (1956); When Americans Complain (1966); and Ombudsmen and others (1966).

The Telford Taylor Papers collect the work of Telford Taylor as a lawyer, legal scholar, writer, and historian. The documents include Taylor's work in Nuremberg with the International and Nuremberg Military Tribunals, his work within departments created by the New Deal, some of his legal case files (particularly on civil liberties cases), and other professional interests that Taylor had. The collection also contains Taylor's writings including drafts of his books, speeches, interviews, teaching materials, and much of the research behind these pursuits. The genre of materials includes official reports, correspondence, manuscripts, annotated texts and photographs. The collection also contains Taylor's research materials in the form of annotations, notes, and clippings.