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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 collection consists of the editorial and production archives of Vanguard Press: correspondence, manuscripts, contracts, memoranda, galley proofs, photographs, clippings, and printed materials. The correspondence and editorial files contain a wealth of detailed information about individual authors and the growth and development of the Press. Among the cataloged correspondents are: Nelson Algren, Saul Bellow, Stephen Vincent Benét, William Rose Benét; Phyllis Bottome; Pierre Boulle; Jocelyn Brooke; Cyril Connolly; A.J. Cronin; Nigel Dennis; John Dewey; Max Eastman; James T. Farrell; Vardis Fisher; Richard Garnett; Theodor Seuss Geisel; Louis Golding; Paul Goodman; Horace Gregory; Geoffrey Grigson; Lillian Hellman; William Heyen; Harold L. Ickes; Christopher Isherwood; Alfred Kazin; Philip Lamantia; Sinclair Lewis; Emanuel Litvinoff; Dwight Macdonald; Archibald MacLeish; Marshall McLuhan; Thomas Mann; Edgar Lee Masters; H. L. Mencken; William Meredith; Joyce Carol Oates; Katherine Anne Porter; Barbara Pym; William Sansom; William Saroyan; Ramon J. Sender; Upton Sinclair; Rex Stout; Edith Sitwell; Paul Theroux; Lionel Trilling; Harry S. Trumam; Louis Untermeyer; Eudora Welty; Richard Wilbur; and Thornton Wilder. There are some manuscripts by Bellow; Bottome; Boulle; Farrell; Grigson; Litvinoff; MacDonald; Oates; John Cowper Powys; Arthur Schlesinger, Jr.; Patrick Tanner; William Targ; Theroux; and Sitwell.