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Collection includes 67 letters and telegrams, by Alexander's older brother Nikolaĭ; 65 letters and notes, some copies, by Nicholas II, from 1902-1913; a drawing and notes by Alexander III; and drafts of letters by Meshcherskiĭ. Also included is a group of letters in different hands hitherto identified as having been written by Nikolaĭ, Duke of Leuchtenberg, to Meshcherskiĭ.

Correspondence, manuscripts, notes, memoranda, notebooks, notecards, proofs, photographs, microfilms, and printed materials. The Papers include the manuscript research materials and correspondence for each of his books except his biography of Theodore Dreiser. Among the correspondents are William Benton, Bruce Catton, Carey McWilliams, Mrs. Fremont Older (Cora Miranda Baggerly Older), and Thornton Wilder.

Professional correspondence, diaries, unpublished articles, lecture notes, abstracts, and other manuscripts by Mitchell.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.

The William Muschenheim collection spans from 1929 to 1957, with bulk dates from 1931-1950. The collection documents approximately 130 separate jobs and is made up of architectural drawings, correspondence, accounts, estimates, specifications, invoices, contracts, samples, invoices, and other material related to Muschenheim's professional projects. 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.

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