Professional correspondence, diaries, unpublished articles, lecture notes, abstracts, and other manuscripts by Mitchell. Subjects include economic theory and its history, business cycles, money, national planing, anthropology and psychology, and published material by Mitchell and others.

The Willard L. Severinghaus Papers include the personal and professional papers of Columbia University Physics professor Willard Lesly Severinghaus, as well as a small amount of material related to the extended Severinghaus family. There are also record books from the Terre Haute, Indiana German Methodist Episcopal Church where Severinghaus's father, John F. Severinghaus, was pastor.

Willard Thompson was an American professor of journalism and Dean of the General Extension Division and Summer Session (1969-1970), later Dean of the Summer School at the University of Minnesota. Papers include correspondence, meeting minutes and agendas, programs, lists and resolutions. The papers reflect Thompson’s role as Public Relations Committee Chairman for the Galaxy Conference (1969) and the subsequent Wingspread Conference (1976). Noteworthy among the correspondents because of his role in both conferences is Alexander N. Charters.

Architectural drawings, correspondence, accounts, estimates, specifications, invoices, contracts, samples, invoices, and other material related to William Muschenheim's projects. The William Muschenheim Architectural Drawings and Papers span 1929-1957, with bulk dates 1931-1950. Muschenheim's papers document 130 separate jobs, and the visual material (described in RLIN VIM), consists of 3081 sheets of drawings. The projects mainly represent Muschenheim's work in New York City, but also include work in Albany (NY), Amenia (NY), Bridgehampton (NY), Chappaqua (NY), Hampton Bays (NY), Malverne (NY), Massapequa (NY), Nassau Point (Long Island), Washington (CT), Washington DC, Westhampton Beach (NY), and Woodstock (NY), among other locations. William Muschenheim also had numerous clients which included the following family members: Carl Muschenheim, Elsa Muschenheim, and Frederick A. Muschenheim. In addition to the many clients for whom he did alteration work, Muschenheim also worked with a wide variety of companies including Bigelow Carpet Company, C.G. Flygare Inc., Excel Metal Cabinet Co., F. Schumacher & Co., Famaes Development, Hans Knoll, Howard & Schaffer, Inc., Kurt Versen Lamps, Inc., Ledlin Light Designers, Portland Cement Association, and Thonet Brothers, among many others

Correspondence between William Samuel Johnson, 1727-1819, and his son Robert Charles Johnson, 1766-1806, concerning personal business in Connecticut and a father's advice to a young man entering his law career. Some of the father's letters of special interest were written during his term as U.S. Senator (1791), and some concern British-French trade relations, 1793. There are also copies of letters to Johnson from Cadwallader Colden, Silas Deane, James Duane, John Fitch, Jonathan Trumbull, and William Williams. Other letters have been added

Notes, videos and films relating to Geraldo Rivera's 1972 exposé of conditions at Staten Island's Willowbrook State School.

Papers of the American educator, author. Yefroikin also used the name S. Efron. Collection includes correspondence, 1912-1966; memorabilia, 1902-1968; and manuscripts, 1920-1968, relating to Yefroikin's writings and to Jewish secular education, particularly the Workmen's Circle schools. Correspondents include Chaim Grade and Melech Ravitch.