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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 relating to Erskine's various educational, musical and literary interests; manuscripts of his writings; lecture notes for college courses; souvenirs of his army service in World War I and his Columbia University professorship, and student papers from his own school and college days. Also, biographical file, scrapbooks, and articles.

Correspondence, manuscripts, notes, documents, book typescripts, photographs, and printed materials covering the time from Dorfman's early interest, as a graduate student, in the economic thought of Thorstein Veblen until his retirement. There is correspondence with his academic colleagues, students, publishers, and the family and students of Thorstein Veblen, as well as manuscripts, typescripts, drafts, revisions, notes, photographs, pamphlets, and related materials for his articles and books which include: THORSTEIN VEBLEN AND HIS AMERICA, 1934; THE ECONOMIC MIND IN AMERICAN CIVILIZATION, 1946-1959; EARLY AMERICAN POLICY, 1960; INSTITUTIONAL ECONOMICS, 1963; TYPES OF ECONOMIC THEORY, 1967; and NEW LIGHT ON VEBLEN, 1973

Correspondence, manuscripts, documents, notes, notecards, journals, diaries, photographs, slides, memorabilia and printed materials documenting Goodrich's career in the field of Chinese language and history, as well as materials on the cultural affairs of twentieth century China. Among the cataloged correspondence are Joseph Alsop, Pearl S. Buck, Norman Cousins, Philip C. Jessup, H.H. Kung, Owen Lattimore, and Nathan Pusey. Part of the collection is arranged in Goodrich's alphabetical subject/name file and the remainder is arranged alphabetically. The correspondence is from colleagues, students, business associates, friends, etc. The subject files are on a variety of topics concerning China, the Far East, printing, medicine, the arts, and technology; material on the Chinese Civil Service Examination; associations, schools, foundations, missions and their work in the Far East.

Correspondence, manuscripts, notes, technical reports, memoranda, questionnaires, interview schedules, personal and professional documents, several photographs, one tape recording, and printed materials. The correspondence files contain letters to colleagues and researchers such as Bernard Berelson, Robert Lynd, Robert Merton, and Frank Stanton. The subject files document Lazarsfeld's many research projects such as the Admissions Officers Project, 1964-1970, the Planning Project for Advanced Training in Social Research, 1950-1955, and his first major endeavor, the Princeton Radio Research Project, 1937-1940. There are complete records for his 1954-1955 study on McCarthyism's effect on college teaching. These original materials consisting of correspondence, interview schedules, and questionnaires contain many detailed comments which could not be included in the published version of this study, THE ACADEMIC MIND (1958). Numerous files relate to Lazarsfeld's position as Associate Director of the Bureau of Applied Social Research (BASR). There are manuscripts of books, research papers, lectures, and articles by Lazarsfeld as well as by his students and colleagues.

Working files of the architectural historians Rudolf and Margot Wittkower, dealing with Baroque and Renaissance painting, sculpture, and architecture. Included are manuscripts, notes, drawings, annotated proofs of articles and books, and some correspondence related to his writings and lectures. The majority of the files document his teaching, research, and writing at the University of London, 1934-1955, and at Columbia University. There are also some manuscript notes from his early years in Italy and Germany. Series I has been divided into six parts: Artists, Subjects, Book Manuscripts, Proofs, Notes, and Printed Materials. Some of the major files are Bernini, Bramante, Carracci, Michelangelo, and Raphael (Artists); Baroque Painting, Patronage, Rome, St. Peter's, Slade Lectures on the history of art (Subjects); ART AND ARCHITECTURE IN ITALY, BORN UNDER SATURN, and MATTHEWS LECTURES: GOTHIC VS. CLASSIC (Book Manuscripts). In addition there are proofs of essays and reviews with manuscript corrections and emmendations, copies of several of his own published works with his manuscript corrections, and typescript insertions for new editions. The Notes consist of eight card file boxes with notes chiefly relating to the Baroque period and Bernini. Materials created by or related to Rudolf Wittkower's wife, the architect and interior designer Margot Holzmann Wittkower, can be found primarily in Series II, IV, V, and VI. Material created or maintained solely by Margot Wittkower is located in Series VI; however, material she shared with Rudolf Wittkower is located in Series II, IV, and V.

Correspondence, manuscripts, subject files and research notes of Sigmund Diamond. Included among the correspondence are Diamond's letters to and from various distinguished members of Columbia University and other academic insitutions, as well as correspondence with many noted sociologists and historians. Included in the manuscripts is Diamond's "In Quest." The subject files comprise material from Diamond's tenure at Columbia and include some material pertaining to his forced departure from Harvard in the 1950's due to his previous communist affiliation, and his active role in maintaining the efficacy of the Freedom of Information Act. The research files include microfilms and notes.

Professional correspondence, diaries, unpublished articles, lecture notes, abstracts, and other manuscripts by Mitchell. Subjects include economic theory and its history, business cycles, money, national planing, anthropology and psychology, and published material by Mitchell and others.