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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

This archive consists of manuscripts, business files, production materials, and correspondence from 1966 -2012. The journal Hanging Loose was first published in 1966 was preceded by the journal Things, begun by two Columbia College students Emmet Jarrett and Ron Schreiber, Hanging Loose Press founders. The most recent issue #101 was published in 2013. The press has also published books, mostly poetry. The selection process is collective and inclusive. Hanging Loose publishes high school students and has dedicated issues to literature written by prison inmates. HL published Hettie Jones, long-time Columbia-affiliated poet Paul Violi, Jack Agueros, Sherman Alexie, and Charles North, as well as many of the collective members. Denise Levertov is a former board member.

The collection contains correspondence with the authors, including contracts signed with authors as well as negotiations with the authors over various aspects of publishing their works; financial records documenting many aspects of the operation of Harper & Brothers, including royalties paid to authors, records of stock offerings and company reorganizations, and general ledgers which contain daily notes on all aspects of the operation of the business; book catalogues and trade lists; research materials collected by Eugene Exman for his history of Harper & Brothers; visual materials, from drawings and photographs of Harper's authors to colophon designs and an oil painting of the original Harper's building.

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.

Records of literary agents Paul Revere Reynolds, founder of Paul R. Reynolds agency, and his son, Paul Revere Reynolds, Jr. The records consist of correspondence, contracts, scripts, and financial records. The files are rich in correspondence between authors and agents and provide important information about some of the most significant works published in the last seventy years.

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.