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This collection consists of glass plate negatives compiled by Columbiana curators and University Archives staff. It includes a color glass plate negative of a photograph of Nicholas Murray Butler.

Mitchell's corrected manuscripts and correspondence and notes pertaining to them. Personal correspondence, including some with her husband, Wesley Clair Mitchell, forms only a small part of the collection. Also, notes and letters related to various projects in which she was involved and two boxes of photographs and drawings.

Papers of Thorndike, consisting of correspondence, mansucripts, diaries, notes, photocopies of medieval scientific manuscripts, glass slides, books, pamphlets, and reprints. The correspondence relates to his scholarly research and publication in the field of the history of medieval science. Also, some family and personal correspondence. One half of the collection consists of photostatic copies of manuscripts Thorndike indexed in his major work, A CATALOGUE OF INCIPITS OF MEDIAEVAL SCIENTIFIC WRITINGS IN LATIN (1963), the first draft, final copy, galley proofs, related correspondence, and extensive card files of notes used in compiling the work. There is also a typescript of the 1937 edition. Thorndike's 76 volumes of personal diaries, 1902-1963, detail his daily activities, appointments, trips abroad, and lists of reading. In addition there are his other manuscripts for journal articles and book reviews.

808 glass-plate negatives and ten black-and-white telescopic photographic prints of astronomical subjects.

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

Manuscripts, correspondence, photographs, documents, printed materials, books, and other papers of Ira V. and Edita Morris from 1892 to 1988. The couple's literary careers are documented by typescripts, notes, book reviews, and published versions of their work. Some of these materials are written in French, German, Swedish, Japanese, and other foreign languages. Included are subject files, financial records, and materials related to the Hiroshima House for atomic bombing victims and the couple's political activities. In addition, there is correspondence, documents, and photographs related to Edwin Seaver and his family.