The papers include correspondence, manuscripts, documents, photographs, and printed materials. Among the correspondents are Boris Bakhmeteff, Pavel Mili︠u︡kov, Ivan Shmelev, and Petr Wrangel. There is a manuscript of General Denikin's entitled, "Ocherki russkoĭ smuty," and of some of his other writings. Subject files deal with the Civil War and the emigration. Extensive printed materials include General Denikin's library and a collection of chiefly Russian emigre periodicals. Boxes 51, 52, 56, 61 have been integrated in the SEEC periodical collection.

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.