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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.

The records of W.R. Grace & Co. cover the rise of the Grace shipping business from 1864 until World War II. The early correspondence concerns all aspects of the shipping business in New York and South America, mining interests in Peru and Chile, the railroad in Costa Rica, the inter-ocean canal planned for Nicaragua, and political interests throughout Central and South America. There are letter books, correspondence, and scrapbooks of clippings for all aspects of W.R. Grace's career. There are minute books and other documents for more than 50 subsidiary companies owned by W.R. Grace & Co. or by family members. The papers of Joseph Peter Grace (1872-1950) continue the business, family, and philanthropic activities until 1942. There are also 20 reels of motion picture film about the Grace Co. South American interests in the 1950s.

Correspondence, manuscripts, documents, photographs, memorabilia and printed materials of John Mitchel, John Purroy Mitchel, and other members of the Mitchel and Purroy families. The collection concerns Irish nationalism, family matters, Purroy family business interests in Central America, the John Purroy Mitchel Memorial and William Brown Meloney's files relating to his research and writing of "The Story of John Purroy Mitchel" along with the manuscript and typescript drafts for this unpublished biography.

Papers of Stillman include over 100 items pertaining to the business enterprises of his father, Charles Stillman of Brownsville, Texas, who was engaged in shipping and trade, real estate, and railroad investment. A large portion of the collection documents of James Stillman's activities in banking, in railroad financing, and in other of his business and industrial interests. The letters, legal documents, and miscellaneous papers are representative of the entire span of his career. Included in the correspondence are letters from many prominent financiers and industrialists of his day, including many from William Rockefeller; letters from President Grover Cleveland, some personal in nature and some concerned with business transactions; nine letter books of James Stillman, covering the years 1886-1897, 1906-1918; letter books of his secretary Miss K. Bredin, 1908-1916; journals for the years 1889, 1891, 1898, 1899; bank book recording Stillman's drafts, 1911-1914, on the London firm of Baring Brothers; four diaries, 1881-1884; six notebooks; one cash and journal and one ledger, 1868-1871.

Correspondence, manuscripts, typescripts, research files, documents, printed materials, photographs, and memorabilia of Mr and Mrs Hough. Correspondence includes both personal and business letters, dealing with wildlife conservation, civic interests, and birding. There is some correspondence of George A. Hough, Sr., father of H.B. Hough, who was editor of the New Bedford MA Standard. Most of the correspondence is arranged alphabetically, by personal name or subject, out-going and in-coming filed together. Henry and Elizabeth Hough's correspondence, for which there are no in-coming or related letters, are filed chronologically. Cataloged correspondents include Calvin Coolidge, Max Eastman, Helen Keller, John F. Kennedy, Emily Post, and James Reston.

This collection of contracts, patent assignments, other legal documents, and correspondence of Edison and others, deals with the development of the telegraph and the expansion of the telegraph network. There are 31 cataloged legal documents concerning his telegraphic patents, his company (Pope, Edison & Company), and its purchase by The Gold and Stock Telegraph Company in 1870. Other contracts concern the early work of Samuel F.B. Morse and other inventors, and later telegraph companies.

Correspondence and publishing agreements for many of their authors in the pre-World War I period.

Correspondence, manuscripts, typescripts, contracts, legal briefs, patents, and other documents, music scores, cartoons, technical drawings, account books, blueprints, photographs, clippings, printed legal briefs & transcripts, proofs, scrapbooks, and other printed materials of William M. Speer.

Correspondence, manuscripts, notes, clippings, and photographs of or relating to Cardozo, including his lecture notes as a student at Columbia, 1885-1889, and his commonplace books. Also, four boxes of printed and manuscript material collected by George S. Hellman while writing BENJAMIN N. CARDOZO, AMERICAN JUDGE; and photocopies of letters, manuscripts, and notebooks of original Cardozo papers in the Cardozo School of Law Library. Materials re. his estate and will have been added.

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