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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

This collection primarily contains materials related to Percy and Harold Uris and their real estate businesses. Correspondence, financial records, and estate papers document the professional and personal lives of the brothers and their wives. The bulk of the business records are from their properties at 380 Madison Avenue and 300 Park Avenue. There is limited information about the other Uris properties and Uris Building Corporation. Finally, the collection contains records from the Uris Brothers Foundation, Inc about the family's philanthropic endeavors.

Included are Fellheimer & Wagner's architectural drawings for the Union Passenger Station in Macon, Ga. (1915); the State Street Station in Chicago, Ill. (1924); the Passenger Station in South Bend, Ind. (1927); the Kentucky and Indiana Railroad Terminal in Louisville, Ky. (1928); the Springfield Union Station in Springfield, Mass. (1924); the New York Central Rail Road Buffalo & East Buffalo Terminal Improvement Passenger Station and Curtis Street Passenger Station in Buffalo, NY (1927-1928); the Cincinnati Terminal in Cincinnati, Ohio (1930-1931); the Passenger Station in Elyria, Ohio (1924); the Erie Passenger Station in Erie, Penn. (1928-1931); and the Toronto-Hamilton & Buffalo Railway Company in Hamilton, Ont., Canada (1931).

This collection consists of 37 letters written in reply to a questionnaire sent out by the Philadelphia attorneys, Campbell, Reall, Foster, Bright, and Dallas, in regard to the case of SHARPLESS ET AL. VS. THE MAYOR, ALDERMEN, AND CITIZENS OF PHILADELPHIA IN 1853. These letters of reply contain information for 17 states, New Hampshire, Connecticut, Rhode Island, New York, Pennsylvania, Ohio, Indiana, Iowa, Arkansas, Virginia, Kentucky, North Carolina, Georgia, Tennessee, Alabama, Maine, and Louisiana. The letters give brief but full accounts of the history, legislation, and policy of aid to railroads by local governments in these states up to 1853, the year in which all of the letters are dated. The letters were written by state officials and functionaries and are all in script of the clarity of mid-19th century legal hands. Also, articles of incorporation for the West Virginia railroads Clarksburg, Weston and Glenville Railroad and Transportation Company, Weston and Buckhannon Railroad Company, Weston and Elk River Railroad Company, Weston and West Fork Railroad Company, and Buckhannon River Railroad Company; railroad stock certificates; and scrapbooks containing news clippings relating to the Great Erie Railway War, 1868, and sample railroad tickets for the New York Central Railroad.

This collection contains architectural photographs, drawings and records related to the architectural projects and designs of Warren and Wetmore, principally in the United States, but also representing commissions in Canada, Cuba, and Puerto Rico. Unfortunately, the bulk of architectural drawings produced by the firm are no longer extant. Additionally, it holds a variety of photographs and other records used as reference materials in the course of Warren and Wetmore's professional work. Lastly, a small group of student and personal papers and photographs from Whitney Warren completes the collection.