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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 correspondence, speeches, subject files, photographs, and printed and miscellaneous material of Hogan. The correspondence, speeches, and other material relate primarily to his activities as District Attorney, and to his unsuccessful campaign for the U.S. Senate, 1958. The papers also reflect Hogan's deep concern for Columbia University, as a Trustee and a member of numerous alumni committees. Among the major correspondents are Harry J. Carman, Dwight David Eisenhower, Robert F. Kennedy, Arthur Hays Sulzburger, and Herbert Bayard Swope.

Correspondence, manuscripts, documents, photographs, memorabilia, and printed materials. Correspondence is both professional and personal, relating primarily to Fuld's duties in the New York District Attorney's Office, as a judge in the state and federal courts, and to his civic work for the Jewish Theological Seminary, the City College of New York, New York University, and the Columbia University Law School. Major correspondents include: Thomas E. Dewey, Louis Finkelstein, Herbert Lehman, and Nelson A. Rockefeller. The rest of the collection consists of Fuld's briefs, opinions, memoranda, forms of indictments, appeals cases, reports for the New York State Court of Appeals from his appointment in 1946 through 1973, and manuscripts of his speeches and lectures. The memoranda series deals chiefly with investigations into organized crime. In addition there are biographical materials, memorabilia, and photographs.

Correspondence, manuscripts, diaries and notebooks, and legal briefs of Willard Bartlett. There are 150 letters from Elihu Root to Willard Bartlett. Also, correspondence by and relating to the Bartlett and Buffum families.

Correspondence, manuscripts, typescripts, contracts, legal briefs, patents, and other documents, music scores, cartoons, technical drawings, account books, blueprints, photographs, clippings, printed legal briefs & transcripts, proofs, scrapbooks, and other printed materials of William M. Speer.