The Slavic mss., 1817-1947, consists of letters and documents of Russian and Czech political and literary figures, including Russian author Ivan Alekseevich Bunin, 1870-1953, and Czech politicians Tomáš Garrigue Masaryk, 1850-1937, and Jan Garrigue Masaryk, 1886-1948.
The Byrnes mss., 1856-1904, consists of papers collected by Robert Francis Byrnes, 1917-1997, historian, for his book Pobedonost͡sev, Bloomington, London, Indiana University Press, 1968, consisting of correspondence of Konstantin Petrovich Pobedonost͡sev, 1827-1907, statesman.
The Amfiteatrov mss., 1890-1948, consists of the correspondence and writings of journalist and playwright Aleksandr Valentinovich Amfiteatrov, 1862-1938.
The Eastman mss. IV, 1890-2009, consist of the photographs, correspondence, personal papers, writings, and artwork of Max Eastman, 1883-1969; Yvette Szekely Eastman, 1912-2014; and Eliena Krylenko Eastman, 1895-1956.
The Trotskii mss., 1900-1957, consist principally of the correspondence of Lev Trotskii, 1879-1940, Russian communist leader, and Max Eastman, 1883-1969, author, during the period when Eastman was preparing his book about Trotskii in 1922 and 1923 and later when he served unofficially as Trotskii's literary agent from 1929 to 1933.
The Lockhart, R. mss., 1906-1969, consist of the correspondence, writings and memorabilia of Sir Robert Hamilton Bruce Lockhart, 1887-1970, diplomat and writer.