Architectural drawings for buildings designed by Hamlin including proposed alterations for the Charles Dudley Warner House, circa 1885; pumping station Clear Stream (or Clear Stream Station), Long Island, 1886; American Classical School, Athens, Greece, 1886-1888; proposed cottage for Mrs. R. Hoe at Sea Cliff, Long Island, 1887; an addition to Clinton Hall at Blair Presbyterian Academy, Blairstown, New Jersey, circa 1896; Soldier's Monument, Whitinsville, Massachusetts, circa 1904 (Hamlin was the architect and Herman A. MacNeil was the sculptor); and miscellaneous and unidentified structures. Also included are drawings done by Hamlin while a student at the Massachusetts Institute of Technology, 1876-1877; sketches done by Hamlin on travels both in the United States and abroad, 1867-1923; photographs of various unidentified buildings and architectural drawings; manuscripts of "ARCHITECTURAL SHADES AND SHADOWS" with related drawings"History of American Art" (unfinished, in French), circa 1923, and "MODERN ARCHITECTURE AND THE CRITICS" circa 1923. Personal materials included undated photographs of A.D.F. Hamlin; a photograph of an 1835 portrait of Cyrus Hamlin; a volume containing condolences, 1926, on the occasion of A.D.F. Hamlin's death; and a scrapbook"Memoirs of Amherst, Class of '75" containing programs, invitations, clippings, notes, essays, exam questions, steamship passenger lists, and other materials.

The papers include correspondence, photographs, and articles written by I︠U︡zefovich on the defense of Port Arthur during the Russo-Japanese War. Also included are scrapbooks relating to his life and career; and printed material.

A collection of prints, photographs, pamphlets, clippings, playbills, and programs dealing with the theater, chiefly American and English, in all its aspects including drama, opera, dance, movies, puppets, and spectacles. The majority of the material documents the 19th century.

Office files consisting of correspondence, reports, memoranda, and other documents relating to the operation of the Museum. Included are numerous biographical and topical folders on the theatrical subjects such as David Belasco, Costumes, French stage models, Helen Hayes, etc. Masks and Puppets account for 29 folders.

Chemist, Professor, and President of the New York Metropolitan Board of Health. Professor Chandler taught at Union College before joining the faculty of Columbia University where he taught in the Chemical Department, the College of Physicians and Surgeons, and served as one of the founders and long-time Dean of Columbia University's School of Mines. He was interested in Industrial Chemistry and Public Health, serving on the New York Metropolitan Board of Health for many years and implementing a number of significant public health and public housing reforms.

Letters, documents, clippings, and printed matter related to the work of the Citizens Union of New York, including correspondence, memoranda, and reports which survey, analyze, and criticize bills introduced in the state legislature and city council; 244 boxes of "Who's Who" biographies of candidates for city and state offices; files of campaign and election materials; records of affiliated "good government" organizations in New York City; and extensive financial records.

A collection concerned with the various phases of black life in America, containing clippings, pamphlets, photographs, pictures, extracts from periodicals, and a representative group of approximately 350 letters, signatures, manuscripts, and documents. Among the letters are several each from Countee Cullen, Frederick Douglass, Alexander Dumas, fils, William Lloyd Garrison, Claude McKay, Abraham Lincoln, Henry Mencken, William Pickens, Albert A. Smith, and Booker T. Washington. Also, eighteen slavery documents.

Correspondence, scripts, slides, scores, set designs, prompt books, scrapbooks, costume designs, programs, playbills, broadsides, clippings, fliers, photographs, announcements of forthcoming productions, clippings, and related materials. Columbia University theatrical groups include The Columbia Laboratory Players, The Columbia College Dramatic Group, The Wigs and Cues, The Summer Session Classes in Play Production, The Morningside Players, and the Columbia Theatre Associates which superseded all the preceding groups. There is an extensive file on the Columbia Laboratory Players; including production files that document the various stages involved in putting together a dramatic production. In addition there are typewritten scripts representing the spectrum of plays that were produced over the Lab's active years. There are photographs of only a few specific plays. Non Lab materials relate to Rehersal Course productions, a Columbia English Department course that was closely affiliated with the Lab players

Personal and professional papers of Stedman, including correspondence, letter books, diaries, poetry manuscripts, scrapbooks, photographs, and genealogical materials for the Stedman and Dodge families. Correspondence and manuscripts of his mother, Elizabeth Clementine Dodge Stedman Kinney (1810-1889), poet and diarist, and of his granddaughter, Laura Stedman Gould (1881-1941), author and editor. Also, editions of Stedman's LIBRARY OF AMERICAN LITERATURE including printed materials relating to the marketing; and an album of Civil War photographs by Mathew Brady, inscribed by the photographer to Laura H.W. Stedman as well as additional loose photographs by Brady.

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