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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

The records include annual reports, board minutes, budgets, by-laws, correspondence, memos, publications, reports, scrapbooks, photographs and printed material. They document the settlement and its antecedent institutions from 1854 to 1994, offering a unique view of the first wave of the settlement house movement in America, as well as related philanthropy and social welfare activities in New York City over a 140 year period. The origins of Goddard-Riverside Community Center are documented in Series I, which includes eight institutional subseries. These records provide a wealth of information on philanthropic, social welfare and settlement work from the mid-19th century through the 1950s. Series II - IV document the activities of the settlement from 1959 to the 1990s, with a particular emphasis on the urban renewal period of the 1960s. Items in Series VII include photographs of staff, activities, facilities of Goddard-Riverside Community Center, as well as several of its predecessor institutions.

Papers of Stillman include over 100 items pertaining to the business enterprises of his father, Charles Stillman of Brownsville, Texas, who was engaged in shipping and trade, real estate, and railroad investment. A large portion of the collection documents of James Stillman's activities in banking, in railroad financing, and in other of his business and industrial interests. The letters, legal documents, and miscellaneous papers are representative of the entire span of his career. Included in the correspondence are letters from many prominent financiers and industrialists of his day, including many from William Rockefeller; letters from President Grover Cleveland, some personal in nature and some concerned with business transactions; nine letter books of James Stillman, covering the years 1886-1897, 1906-1918; letter books of his secretary Miss K. Bredin, 1908-1916; journals for the years 1889, 1891, 1898, 1899; bank book recording Stillman's drafts, 1911-1914, on the London firm of Baring Brothers; four diaries, 1881-1884; six notebooks; one cash and journal and one ledger, 1868-1871.

The collection consiste of correspondence, memoranda, reports, bulletins, clippings, photographs, awards, and printed material. The files, arranged by genre and topic and reflect her philanthropic and legislative work in the areas of health, specifically cancer, heart disease, and mental health. Her civic and legislative work is covered in detail, as well as her private interests and activities.

Correspondence, manuscripts of poems, and manuscripts of lectures by Benjamin. The correspondence consists of original letters of Benjamin, typescript and photostatic copies of Benjamin letters in other libraries, and letters to Benjamin from some of his literary contemporaries including Paul Hamilton Hayne, Willis Gaylord Clark, John Lothrop Motley, and Fitz-Greene Halleck. Many of the letters relate to Park Benjamin's lecture tours. There are other family letters and many documents relating to the Benjamin family,and two letterbooks of John Lothrop Motley. Also, a large amount of genealogical material of the Benjamin family, and its related families from the 16th century to the present day. There are also financial records, monographs, clippings, and photographs.

Correspondence, manuscripts, documents, photographs, memorabilia and printed materials of John Mitchel, John Purroy Mitchel, and other members of the Mitchel and Purroy families. The collection concerns Irish nationalism, family matters, Purroy family business interests in Central America, the John Purroy Mitchel Memorial and William Brown Meloney's files relating to his research and writing of "The Story of John Purroy Mitchel" along with the manuscript and typescript drafts for this unpublished biography.

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.