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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

The papers relate chiefly to the business, financial, real estate, military, civic and personal activities of Nicholas Fish. There are letters from various military figures concerning army provisions during the Revolution, letters relating to lands given to Fish for his services during the war, twenty letters from various individuals to George Clinton (1739-1812), and ten letters to DeWitt Clinton. The Hamilton Fish letters deal with business matters of his father, Nicholas, after his death. There are a few personal letters from several family members and a diary of Nicholas Fish from 1784. The documents consist of real estate and financial matters of the family as well as various petitions on matters of a civic nature

The records include annual reports, board minutes, budgets, by-laws, correspondence, memos, publications, reports, scrapbooks, photographs and printed material. They document the settlement and its antecedent institutions from 1854 to 1994, offering a unique view of the first wave of the settlement house movement in America, as well as related philanthropy and social welfare activities in New York City over a 140 year period. The origins of Goddard-Riverside Community Center are documented in Series I, which includes eight institutional subseries. These records provide a wealth of information on philanthropic, social welfare and settlement work from the mid-19th century through the 1950s. Series II - IV document the activities of the settlement from 1959 to the 1990s, with a particular emphasis on the urban renewal period of the 1960s. Items in Series VII include photographs of staff, activities, facilities of Goddard-Riverside Community Center, as well as several of its predecessor institutions.

The papers consist of correspondence, manuscripts, documents, photographs, and printed materials, chiefly concerning 1907-1917. They are particularly useful for the study of the second Russian State Duma (1907), the Russian Social Democratic School on Capri, the "Vpered" group of Social Democrats, the relationship between Maksim Gorḱiĭ and Leonid Andreev, and World War I. Russian Social Democratic correspondents include Aleksandr Bogdanov, Vladimir Lenin, Anatoliĭ Lunacharskiĭ, I︠U︡liĭ Martov, Georgiĭ Plekhanov, Mikhail Pokrovskiĭ, and Lev Trot︠s︡kiĭ. There are letters by such European socialists as Pablo Iglesias Posse, Karl Kautsky, Rosa Luxemburg, and Benito Mussolini, and a series of letters from Gorḱiĭ to Andreev (1899-1915). There is a large number of petitions ("nakazy" "proshenii︠a︡" etc.) sent by people to Aleksinskiĭ when he was a Duma delegate. Authors of manuscripts in the collection include Vicente Blasco Ibáñez, Gorḱiĭ, Lenin, and Lunacharskiĭ. Printed materials consist of Aleksinskiĭ's writings, issues of chiefly Russian emigre periodicals from 1908 to the 1960s, books by various persons, and ephemera.

These are manuscripts and typescript documents of 34 different princely states that existed as distinct political entities in pre-independence India. Although the majority of these states were tiny principalities in western India (primarily in what is now Rajasthan), some (e.g., Hyderabad) were located in other regions of India and represented major powers in the region at that time.

Correspondence, manuscripts, documents, memorabilia and printed materials. The correspondence deals with literary and political topics, from such people as Hayden Carruth, Irwin Edman, Lola Ridge and Norman Thomas; numerous manuscripts of Mrs. Marshall's writings, including the notes, drafts, manuscripts and proofs of her last novel THE HILL IS LEVEL and various manuscripts of the stories published in THE CONFRONTATION AND OTHER STORIES, and numerous manuscripts of poetry and short stories. Also included is material on the World War II draft of 19-year-olds, economic aid for Western Europe, the Vietnam War, the origin of SANE, the Committee for Nuclear Responsibility, the Amchitka Islands nuclear tests, the Task Force against Nuclear Pollution, and personal correspondence from her own and her husband's families

There are letters from fellow historians, such as John Franklin Jameson and Aleksandr Lappo-Danilevskiĭ; Kadet Party leaders, including Vladimir D. Nabokov and Nikolaĭ Astrov; and others such as Boris Bakhmeteff, Charles Crane, Vladimir Jabotinsky, Louis Marshall, Thomas Masaryk, and Nikolaĭ Roerich. A large correspondence series consists of letters and petitions sent to Miliukov during the Third State Duma (1907-12). Manuscripts include Mili︠u︡kov's memoirs, and his notebooks from the period of the Civil War. There is also a manuscript by Isaak Shkovskiĭ (pseudonym -- Dioneo) on Russian writers and journalists during World War I. Subject files deal with the State Duma, the Civil War, and the emigration.

Letters written to Gay from political and literary contemporaries such as Horace Greeley, Charles Sumner, and William Bryant; reports in letter form from his reporters at the front during the Civil War; and personal correspondence including many letters from his wife, Elizabeth Neall Gay. Letters written to Mrs. Gay from family friends and business associates including many from her husband. Correspondence of other members of the Gay family including Walter Gay, Sarah Gay, and Allan Gay. Diaries, notebooks, and journals of Sydney Howard Gay.

Papers dealing with Johnson's public life in New York City and in the New York State Senate. While Assistant Alderman, Johnson received numerous letters of application from citizens seeking patronage for a variety of municipal offices, ranging from requests to be a night watchman to a position as a municipal court justice. Also, letters, reports, and other documents relating to various municipal services such as health, welfare, fire fighting, street maintenance, water, sewers, railroads, ferries, and stage coaches. Some letters and documents concern Whig Party politics in the 3rd Ward. Johnson's correspondence as a New York Society Library Trustee refers to the proposed merger with the New York Athenaeum. Also, twelve items relating to his term in the State Senate, covering taxation and control of foreign laborers.