There are letters from fellow historians, such as John Franklin Jameson and Aleksandr Lappo-Danilevskiĭ; Kadet Party leaders, including Vladimir D. Nabokov and Nikolaĭ Astrov; and others such as Boris Bakhmeteff, Charles Crane, Vladimir Jabotinsky, Louis Marshall, Thomas Masaryk, and Nikolaĭ Roerich. A large correspondence series consists of letters and petitions sent to Miliukov during the Third State Duma (1907-12). Manuscripts include Mili︠u︡kov's memoirs, and his notebooks from the period of the Civil War. There is also a manuscript by Isaak Shkovskiĭ (pseudonym -- Dioneo) on Russian writers and journalists during World War I. Subject files deal with the State Duma, the Civil War, and the emigration.

Correspondence, manuscripts, photographs, documents, subject files and printed materials of Sergei Grigor'evich Svatikov (1878/1880?-1942), Russian lawyer, historian, publicist, and public figure. The correspondence includes letters from Mark Aldanov, Vladimir Burtsev, Ivan Efremov, Georgii Grebenshchikov, Grigorii Lozinskii, Sergei Mel'gunov, Nikolai Rubakin, George Vernadsky and Mark Vishniak. There is a notebook that belonged to Vera Zasulich. Among the photographs are pictures of Prince Adam Jerzy Czartoryski, Sergei Mel'gunov, and Aleksander Wielopolski. The manuscripts include several by Svatikov as well as many notes, lists and bibliographical compendia relating to his oeuvre. The subject files cover such areas as the Russian Reading Hall in Heidelberg, the Turgenev Library in Paris, and the Russkii akademicheskii soiuz (Groupe academique russe), also in Paris. The printed materials include clippings, materials from the Institute d'ʹetudes slaves, and a number of books by Svatikov.