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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, manuscripts, typescripts, research files, documents, printed materials, photographs, and memorabilia of Mr and Mrs Hough. Correspondence includes both personal and business letters, dealing with wildlife conservation, civic interests, and birding. There is some correspondence of George A. Hough, Sr., father of H.B. Hough, who was editor of the New Bedford MA Standard. Most of the correspondence is arranged alphabetically, by personal name or subject, out-going and in-coming filed together. Henry and Elizabeth Hough's correspondence, for which there are no in-coming or related letters, are filed chronologically. Cataloged correspondents include Calvin Coolidge, Max Eastman, Helen Keller, John F. Kennedy, Emily Post, and James Reston.

The office files of the American Institute of Pacific Relations and the international Institute of Pacific Relations, containing correspondence and reports concerned with international conferences, research programs, and publications programs of both Institutes, and relating to the political, economic, and social problems in eastern and southern Asia and the South Pacific, as well as with problems of American foreign policy. There are many travel letters and on-the-spot reports relating to conditions in China, Japan, Russia, Australia, the Philippines, India, and Pakistan during the period 1933 to 1954.

Correspondence, documents, financial records and memorabilia. The personal correspondence of Lawrence A. Wien, 1960-1983; including memoirs and notes on interests both personal and financial. The Lawrence A. Wien Foundation files include correspondence, 1958-1976, information on the Foundation's 10-year trust, and information on tax returns. Files for the Charles and Rosanna Batchelor Memorial fund consist of general correspondence, grant requests, and miscellaneous financial documents. The Committee to Increase Corporate Philanthropic Giving files comprise a large part of the collection. Among the numerous individual corporations represented are the American Broadcasting Company and the Zale Company. Wien's Foundation for the Improvement of Housing Arrangements for Official Foreign Personnel has personal files for each person receiving the Foundation's benefits, guarantees for those individuals, and letters ment to solicit funds from various corporations

Papers dealing with Johnson's public life in New York City and in the New York State Senate. While Assistant Alderman, Johnson received numerous letters of application from citizens seeking patronage for a variety of municipal offices, ranging from requests to be a night watchman to a position as a municipal court justice. Also, letters, reports, and other documents relating to various municipal services such as health, welfare, fire fighting, street maintenance, water, sewers, railroads, ferries, and stage coaches. Some letters and documents concern Whig Party politics in the 3rd Ward. Johnson's correspondence as a New York Society Library Trustee refers to the proposed merger with the New York Athenaeum. Also, twelve items relating to his term in the State Senate, covering taxation and control of foreign laborers.