Most of the collection concerns the Russian emigration in interwar Europe; a sizeable part deals with the Kadet (Constitutional Democrat) Party in the Russian Civil War. There is correspondence, manuscripts, subject files, photographs, and printed materials. There are many letters by liberal figures, such as Astrov, Viktor Chelishchev, Petr I︠U︡renev, Aleksandr Kizevetter, Pavel Mili︠u︡kov, Vladimir D. Nabokov, Vladimir Obolenskiĭ, Panina, and Ivan Petrunkevich. There are also letters from Ivan Bilibin, Alice Masaryk, and Thomas Masaryk. Manuscripts are chiefly by Astrov, and include memoirs, poems, and lectures. There are also memoirs by Panina, and eulogies by various people on Astrov. Subject files from 1917-1920 have materials on Panina's arrest and trial by the Bolsheviks, Kadet conferences, protocols of meetings of the Kadet Party central committee, and other items. Files on the emigration deal with the Russkiĭ Ochag (Russian Hearth) and other bodies, especially in Czechoslovakia. There are photographs of Astrov, Kizevetter, Nikodim Kondakov, Alice Masaryk, Panina, and others. Printed materials include books, clippings, and offprints by Astrov and others.

The papers consist primarily of the manuscripts of books (including "Witte"), articles, and lectures by V.K. Korostovet︠s︡. There are one or two letters each from Dmitriĭ Mendeleev, Maksim Gorḱiĭ, Pavel Skoropadskiĭ, Boris Pilńi︠a︡k, Konstantin Pobedonost︠s︡ev, Hilaire Belloc, Evelyn Waugh, Rudyard Kipling, John Maynard Keynes, Pavel Mili︠u︡kov, and Lewis Mumford.