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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

Personal, administrative, political, and investigative files of Nickerson. The papers deal almost entirely with his eight years as County Executive, and consist of correspondence, memoranda, manuscripts of speeches, notes, press releases, photographs, and clippings. Among the major correspondents are James A. Farley, Hubert H. Humphrey, Robert F. Kennedy, Edward I. Koch, and Percy E. Sutton. The Investigation Files, which amount to nearly half the collection, document investigation into corruption and mismanagement in numerous Long Island businesses and governmental departments. These investigations, instigated and overseen by Nickerson, were carried out largely by the Commissioner of Accounts, Milton Lipson, and later by Samuel Greason, the first governmental ombudsman in the United States. These files consist primarily of memoranda, transcripts of hearings, payroll and financial accounts, notes, and tape recordings.

Personal, professional, and family papers of the journalist and writer Wilbertine Teters Worden (1866-1949). Some of the files concern her father, Colonel Wilbert Barton Teters (1836-1923) a Civil War veteran, his military reunions, and his gold mining interests in Colorado. Wilbertine Teters Worden's own manuscripts include both fiction (short stories and poetry) and non-fiction (she often wrote love stories from early American history). The collection also includes her diaries dating from 1885 through 1948. There does not appear to be much in the collection related to Worden's novel, The Snows of Yester-year" (Boston, Arena Publishing Company, 1895).