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The collection consists of speeches, reports, publications, research notes, and correspondence. The bulk of the collection relates to Wu's involvement in the American Physical Society as well as her research activities. The correspondence is chiefly professional, relating to C. S. Wu's physics research, professional commitments, appointments, meetings, conferences, and publications. Correspondence also includes letters from individuals around the world praising Wu for her accomplishments, asking advice, arranging speaking engagements, discussing administrative matters, and trading research notes, as well as information on publications and other topics. In addition, the collection contains information on Wu's involvement in the development of an affirmative action program at Columbia University in the 1970's.

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 collection consists of Wurzbach's notebooks, lab books, exams, essays, grade reports and lecture notes as an undergraduate student at Columbia College.

This collection, representing Hildburgh's student days at Columbia University, contains student records, class memorabilia, notebooks of electrical engineering experiments, projects, and research for his bachelor's and master's theses.

Correspondence of Howe, dealing with various departmental affairs such as supplies, laboratory equipment, building maintenance, personnel, students, and examination questions. The chief correspondents are two of Howe's colleagues in the Dept. of Metallurgy, Bradley Stoughton and Arthur Lucian Walker. The Stoughton correspondence runs from 1902 to May 1908, at which time he left Columbia and was replaced by Walker. Although Walker remained in the department until 1929, only his correspondence from May 1908 to 1909 is included. Throughout the correspondence there are frequent references to steel. Most of Howe's letters are originals, while Stoughton and Walker's replies are almost entirely carbon copies. Also, a group of letters of inquiry and letters of reference regarding Howe's effort to find a new assistant during July and August of 1916. The manuscripts and documents consist of twenty reports, with covering letters, by Howe as a metallurgical consultant to various mining and metal companies, 1890-1911; lecture notes, 1884-1896; two scrapbooks of metallurgical photographs; four volumes of blueprint graphs illustrating metallic content; a volume of Howe's experiments on refrigeration, ca. 1888-1889; and various other metallurgical notebooks.