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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 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, subject files, business, personnel, biographical files and financial records. The correspondence files deal with clients: individuals, libraries, museums and book dealers. The chronological files are letters with individual clients, while the alphabetical clients files contain folders for institutional clients, and also include topical subject headings such as "Libraries""Museums", and headings for specific books and works of art. The subject files contain manuscripts, notes for seminars and lectures given by Carolyn Horton on the preservation of books and paper documents and include files on floods, particularly the 1966 flood in Florence, Italy, wet books, form letters, rubbings of books and sample paper. The business records consist of detailed worksheets arranged by client, describing condition of items bound or restored and the type of work done on these items; and complete financial records, i.e., bills, receipts, accounts and personnel records, including payroll, taxes, health insurance and other benefits, which document the operations of a bindery and paper restoration firm. The card file boxes contain details of work done arranged by artist name and by genre, i.e., music, portraits, newspapers, vellum, etc. The biographical files consist of correspondence, notebooks and newspaper clippings relating to Horton's career including her discovery that freezing wet books prevents their molding

The files of Curtis Brown, Ltd. literary agency include correspondence with authors, publishers, and other agents and deal with the editing and publishing of trade and textbooks, serial rights, reprints, dramatic rights, translations and foreign rights, promotion and copyright registration. For each author there are contracts, royalty statements, tax statements, and other financial materials. There is also a contract file, including cancellations and related correspondence, from 1914 to 1988. Among the cataloged correspondents are: Louis S. Auchincloss, W.H. Auden, Erle Stanley Gardner, Robert Graves, Ogden Nash, Ayn Rand, and Sloan Wilson.

Correspondence, manuscripts, memoranda, contracts, and miscellaneous material from the files of Don Congdon Associates, Inc., literary agency, dealing with the editing and publishing of American and English books, serial rights, reprints, dramatic rights, translations, foreign rights, promotion, and copyright restrictions. Select files pre-date the firm's establishment because some clients of Harold Matson Company, Inc. became clients of Don Congdon Associates, Inc. The cataloged correspondence include: Ray Bradbury, Lillian Hellman, William Manchester, William Shirer, William Styron, and Francois Truffaut.

Correspondence, manuscripts, photographs, memorabilia, business records, book catalogs and other printed materials of Louis and Marguerite Cohn and their customers, associates and friends. Correspondents include Stephen Vincent Benʹet, Robert Frost, T.S. Eliot, and Marianne Moore, all among the authors represented in the Crown Octavos series published by the House of Books; there are also manuscripts, proofs and correspondence with printers for this series. Other correspondents include Cyril Connolly, W. Somerset Maugham and Tom Stoppard. Also in the collection are letters and manuscripts from the stock of the shop; notable among these are a series of Graham Greene letters and pages from an autograph book which contains entries from many turn of the century American Literary figures. The collection also include the personal memorabilia of the Cohn and Arnold families. Louis Cohn's participation in World War I as an officer in the French Army is recorded in photographs, documents and memorabilia. Marguerite's childhood collections, among them many early greeting cards, are also included.

Correspondence, by-laws, memoranda, contracts, permission forms, reports, bank statements and other legal papers, advertising, and printed materials.

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.

The files of the literary agency include correspondence with authors, publishers, and other agents and deal with editing and publishing, serial rights, reprints, dramatic rights, translations and foreign rights, promotion, copyright registration, contracts, royalty statements, tax statements, and other financial materials, and the personal affairs of many clients. Among the cataloged correspondents are: Louis S. Auchincloss, Erskine Caldwell, Herbert Gold, Alberto Moravia, Eleanor Roosevelt, and Rebecca West.