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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, lectures, notes, diaries, notebooks, reports, financial records, blueprints, photographs, and printed materials of Y.C. James Yen and the IIRR concerned with the development, sharing, and financing innovative methods of teaching, improving agriculture, health and family planning, and education in impoverished villages. Among the cataloged correspondents are: Pearl Buck, William O. Douglas, Nelson Rockefeller, and DeWitt Clinton.

Correspondence, manuscripts, documents, financial records, memorabilia, and printed materials. The papers relate to numerous organizations--social, political, civic, and philanthropic--with which he was associated. Among these organizations are Legal Aid Society; Prison Association of New York; Outdoor Recreation League; Socialist Democratic League and National Party; American Alliance for Labor and Democracy; Constitutional Democracy Association; National Security League; YMCA, etc. Included among the papers are his journals and diaries, 1884-1950. An incomplete set of his letterbooks 1905-1960 and some family papers relating to real estate and financial matters

These files concern the publication of Anne Frank: the Diary of a Young Girl in 1952, the dramatization of this diary and the subsequent legal disputes with Meyer Levin over the play, and the motion picture made from the play. They also deal with the activities of the Anne Frank Foundation, primarily support for the renovation of the Anne Frank House in Amsterdam and the programs of the International Anne Frank Youth Center. These files include 145 letters from her father, Otto Frank, and letters from Alfred Kazin, Max Lerner, Meyer Levin, and Eleanor Roosevelt. There are also seven letters from Adela Rogers St. Johns and related materials about her own books and the 1963 volume of minutes of the Doubleday & Co. Publishing Committee.

Personal and professional correspondence, including 25 long letters from Professor Henry F. Herbig; manuscripts (mainly speeches); specifications for patents in electrical fields; technical and personal photographs; and memorabilia. Included is a copy of the famous "shot in hand" x-ray photograph, ca. 1896, one of the first ever to be taken. This collection also contains the correspondence, manuscripts, documents, and memorabilia of Professor Pupin's daughter, Varvara Smith, and his son-in-law, Louis Graham Smith. His daughter's letters and documents deal with her financial difficulties, her administration of Pupin's estate and her claims against Columbia University. Louis G. Smith's letters deal with his anti-Communist sentiments and his manuscripts are mainly ideas for popular songs and plays. There are three letters (photostatic copies) to Smith from Dwight D. Eisenhower.

The Union Settlement Association Records document a century of the settlement's activities, and provide a unique view of the first wave of the settlement movement in America. They document social conditions, demographic change, political activity, philanthropy and social work in East Harlem with a strong emphasis on the urban renewal period of the 1950s and '60s. The records include: annual reports, board minutes and committee files, headworker and executive director files, program reports, community organization files, and visual materials such as photographs, maps and architectural drawings.