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Correspondence, manuscripts, documents, and newspapers. These include over four hundred letters to Alexander, as well as miscellaneous letters and telegrams; some of his manuscripts and notes; business records of his law firm; military documents of the western divisions of the Confederate Army; copybooks and letter books; and complete and partial newspapers and clippings from the various Southern newspapers (in particular THE SAVANNAH REPUBLICAN, the DAILY DISPATCH of Richmond, and the ADVERTISER AND REGISTER of Mobile) which carried Alexander's dispatches.

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

There is a letter book / account book of 347 p., 1790-1856, containing 466 draft copies of his commercial and social correspondence with shipping agents in Great Britain, France, Spain, Portugal, Holland, Germany, China, Canada, as well as in the United States. The correspondence concerns Bell's business arrangements, the various cargos he shipped and their disposal, political affairs affecting the shipping trade, laws and treaties of various countries to be dealt with, taxes, embargoes, piracy, threats of war, and other pertinent events. A second account book of 84 p. (many are blank), 1787-1852, for the Ship Stephania and others contains ships' records for 1799 to 1828 and miscellaneous accounts up to 1857. There is a one volume carbon typescript (113 p.) of genealogical notes and reminiscences by Gordon Knox Bell (Regent of the University of the State of New York and grandson of Isaac Bell) and others, ca.1940. There is also an essay and lists of the residents of Greenwich Street (including the Bell and Rogers families) by Elizur Yale Smith with related correspondence, 1940.

Correspondence, manuscripts of poems, and manuscripts of lectures by Benjamin. The correspondence consists of original letters of Benjamin, typescript and photostatic copies of Benjamin letters in other libraries, and letters to Benjamin from some of his literary contemporaries including Paul Hamilton Hayne, Willis Gaylord Clark, John Lothrop Motley, and Fitz-Greene Halleck. Many of the letters relate to Park Benjamin's lecture tours. There are other family letters and many documents relating to the Benjamin family,and two letterbooks of John Lothrop Motley. Also, a large amount of genealogical material of the Benjamin family, and its related families from the 16th century to the present day. There are also financial records, monographs, clippings, and photographs.

Minutes, correspondence, annual reports, press releases, financial records, photographs, memorabilia, audiovisual, digital and printed materials document the philanthropic activities and administration of the Carnegie Corporation of New York. The collection is actively growing, primarily through regular document transfers from the Carnegie Corporation of New York. Andrew Carnegie's biographical information and personal philanthropic activity can be found in Series VII. In addition, his pre-1911 gifts, most notably his donations for libraries and church organs, can be found on microfilm (Series II), in the Home Trust Company Records (VI.A), and Financial Record Books (I.C.1). Grant files (Series III.A), which comprise the bulk of the collection) provide information on projects and institutions founded, endowed or supported by the Corporation. The Special Initiatives series (Series IV) contains the records of task forces, commissions and councils, formed by the Corporation mostly during the 1970s, 1980s, and 1990s to address specific issues. The Corporation's records include those of other Carnegie philanthropic organizations (Series VI), including the Carnegie Foundation for the Advancement of Teaching and the Home Trust Company, both of which shared staff, officers, and office space with the Corporation for a period of time.

Correspondence, minutes of meetings, financial records, publications, notes, subject files, awards, speeches, reports and audiovisual materials document work by the Church Peace Union, its successors Council on Religion in International Affairs and Council on Ethics and International Affairs, and related organizations such as the World Alliance for International Friendship Through the Churches. The first installment of the CCEIA archival materials came to the RBML in 1974, with numerous additions over the years. A major addition in 1982 contained primarily the records of the Board of Directors and their semi-annual meetings, as well as the various programs and institutes of the Council, for the years 1972-1982, along with selected 1930s materials. 1986 addition contains presidential correspondence files, minutes of the Board of Trustees and committees, special projects, programs and conferences files, and the business and editorial files of "Worldview". Correspondents include John Foster Dulles, Jane Addams, Fiorello La Guardia, and Paul Tillich. 1990 and 2000 additions includes files of CCEIA presidents and vice presidents, paper and audiovisual materials on Merrill House Conversation Programs; Educational programs; International Monetary Fund/Lecture series; The Annals Of The Academy Of Political & Social Science; Washington Consultations; Colloquia for the Clergy; Church State Project; Asian Development & The Carribean Initiative; Korea: Year 2000 Project; fundraising files, printed materials and files of the Department of Publications.

Architectural drawings and specifications for Codman's projects, circa 1890s-1930s, including the Martha Codman house in Washington, D.C.; alterations for Edith Wharton and her husband at their three residences, the Mount in Lenox, Mass., Land's End in Newport, R.I., and their Park Avenue home in New York City; work for the Thayer family of Boston, Mass., specifically Nathaniel Thayer's three homes in Boston, Lancaster, Mass., and Newport, R.I. ("Edgemere"), Bernard Thayer's Beacon Hill houyse in Boston, and Eugene Van Rensselaer Thayer's two houses in Boston and Lancaster, Mass.; the Lucy Dahlgren house in New York City; the Archer M. Huntington house on Fifth Avenue in New York City; interior design for John D. Rockefeller in his house "Kykuit" at Pocantico Hills, N.Y.; interior design work for the Vanderbilt family including Cornelius Vanderbilt's "Breakers" at Newport, R.I. and Frederick William Vanderbilt's mansion in Hyde Park, N.Y. and his house on Fifth Avenue in New York City; Oliver Ames' mansion at Pride's Crossing, Beverly, Mass., and his house in Boston; and interior decoration and alterations for Codman's own homes in Newport, R.I. and Roslyn, N.Y. and his villa in France, "La Leopolda", at Villefranche-sur-Mer. Also, lists, descriptions, and postcards of French chateaux, with related correspondence, circa 1900s-1930s, relating to Codman's bibliography on the chateaux of France; and miscellaneous lists of houses in England and France, correspondence, and printed material.

The collection documents the financial transactions of Richard Codman while he was living in Paris, France representing the firm of John & Richard Codman. The collection primarily consists of account books ("memoire des ouvrages"), bills, and some correspondence relating to the interior decoration and furnishing of his houses(s) in Paris. There is a folder, which contains genealogical information from a later relative of Richard Codman. Additionally, included in the collection is one letter, in English, from Richard Codman informing a family member of the death of their brother John Codman III in 1803. The letter details the division of John Codman's wealth among his living family members.