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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 includes nine letters of Ralph Waldo Emerson as well as letters of Louis Agassiz, Amos Bronson Alcott, Oliver Wendell Holmes, Sr., Henry Wadsworth Longfellow, James Russell Lowell, John Lothrop Motley, Charles Sumner, and John Greenleaf Whittier. In addition, there are two incomplete manuscripts by Emerson and one document from the Liverpool Custom-house signed by Nathaniel Hawthorne as Consul for the United States. The collection also includes the corrected typescript, index, and page and galley proofs for Thomas Franklin Currier, A BIBLIOGRAPHY OF OLIVER WENDELL HOLMES (New York, 1953) which was edited by Professor Tilton. Also, some early correspondence and photographs of the Tilton family and friends. There are letters from the actors Annie Louise Ames, Richard J. Dillon, and Hans L. Meery to Tilton's grandfather, Bernard Paul Verne, as well as photographs, tintypes, and daguerreotypes of the Verne family and friends.

The collection consists of diaries, documents, a map of the Zmievskiĭ uezd of the Kharkov region, and printed materials. Diaries by Onopko cover the Civil War period from March 13, 1920 to March 25, 1922, and span from his service in the Kharkov area to his emigration to Prague. The diaries also concern Onopko's years in emigration in France from 1930-1944. Documents are mostly from the Civil War period. Printed materials consist of a clipping and printed drawing.

Papers of General Georgiĭ E. Berkhman that consist of correspondence, subject files, maps and printed materials. Most of the collection concerns the Sarykamysh campaign against Turkey in late 1914, including telegrams, orders, reports, maps and books. There is also Berkhman's official service record, a brief memoir by his wife Elena Vasilévna, clippings, and copies of Tbilisi newspapers from January 1919.

Part of the collection consists of correspondence, manuscripts, notes, military diaries, maps and printed materials that pertain to World War I. Some materials deal with the Civil War, Polish history, medieval Russia and Lithuania, and the history of Russian education. Several folders contain military orders, "prikazy", dating from the early 1900s to about 1925. There are also genealogical materials concerning Russian nobility and Goshtovt's family. The maps primarily concern World War I and the Civil War; also included are a postal map of Russia in 1860, and a map of transportation routes in 1887. The printed materials include clippings, and bulletins published by various emigre military organizations. Most of the books in the collection pertain to the German army during World War I.

The papers consist of correspondence, manuscripts, documents, subject files, newspaper clippings, printed materials, photographs, and drawings. Most of the correspondence concerns Bilyi's activities as Ataman, and the journal "Kazak"; other correspondence is personal or relates to the activities of anti-Communist groups (such as the Anti-Bolshevik Bloc of Nations - ABN). The manuscripts include articles, reminiscences, drafts of appeals and proclamations, and speeches mostly concerning the Cossack movement, Cossack history, and the anti-Communist movement. The documents mostly concern KNOD and related organizations for the period ca.1955-1970; a few relate to the Cossacks in 1919-1945. The subject files contain newspaper clippings, printed materials, notes, and correspondence relating to KNOD, ABN, "Kazak", Ukrainian-Cossack relations, and the Vlasov Movement. The newspaper clippings are mostly from Russian and Ukrainian emigre publications. Printed materials include a set of "Kazak" and ephemera of KNOD, ABN, and similar organizations. There are a few photographs showing Bilyi in Cossack dress and also various Cossack emigre organization activities. The paintings and drawings include portraits of Bilyi and his wife, Tatiana Iurievna Bilyi, in national dress (his Cossack, hers Czech), other Cossack leaders, Cossack heraldry, and a map of "Cossackia."

Correspondence, a diary, documents, subject files and printed materials of Ivan P. Budanov. Correspondence includes both personal letters and items concerning the Cossacks in the emigration. Many of the documents relate to Budanov's legal practice in the Don region, ca. 1910-17. Subject files deal with the Don Cossacks in the Civil War, Cossack emigre groups, and the elections to the post of Ataman of the Don Cossacks in the emigration in the 1930s. Printed materials include maps, a copy of volume 1 of Budanov's "Don i Moskva" and miscellaneous emigre publications and clippings.