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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, articles, research notes, manuscripts, illustrations, printed materials, and a phonograph record collected by Schwartz in compiling his HART CRANE, A REFERENCE GUIDE (Boston, G.K. Hall [1983]). Among the correspondents are Alfred Gilman and Allen Tate. There is also a xerox copy of the script for a production of "The Bridge" by Hart Crane as a dance drama performed at Bennington College in the early 1930s

Typescripts and printed copies of papers presented at the New York Philosophical Club, including papers by John Dewey and Bertrand Russell. Also, a manuscript volume of including meeting minutes, correspondence, attendance, speakers at the Club, dating from 1900 to 1919, is also included.

Professional correspondence, diaries, unpublished articles, lecture notes, abstracts, and other manuscripts by Mitchell.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.