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Business correspondence, editorial memoranda, circulation and financial reports, details for the construction and enlargement of the Pulitzer Building on Park Row, and general papers of THE WORLD. The earlier part of this collection is made up of all materials brought to the attention of Joseph Pulitzer during his editorship and that of his son, Ralph Pulitzer. For the time from Joseph Pulitzer's death in 1911 until ca. 1920, the papers are primarily the files of THE WORLD's "Bureau of Accuracy and Fair Play" directed by Isaac D. White. During the 1920s and until 1931, there is also much material from other departments of the paper such as the composing room, the purchasing department, and the auditors. Also included is a re-recorded audio tape from cylinders originally placed in the World Building cornerstone, October 9-10, 1889. The materials from 1932 until 1940 are insurance policies for the Pulitzer Building and financial reports winding up the affairs of the Pulitzer's Press Publishing Company. Materials collected by R.H. Lyman of THE WORLD's staff from 1893 until 1931 have been added.

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